Abstract
In recent decades, urban natures have provided salient entry points to examine the socio-ecological transformations of cities. These changes are often highly diversified because of site-specific evolutionary and historical peculiarities – complicating catch-all attempts to both theorise about and plan for urban natures. Nevertheless, urban nature scholarship and municipal planning’s overriding focus on the spatiality of cities often overlooks these diverse cycles, rhythms and trajectories that comprise urban green spaces. To remedy this, we argue for an approach that takes the full breadth of urban nature temporalities into consideration, in practice as well as in theory. To this end, we consider the temporalities of urban natures, in their wider pluralistic, polyvocal and multiple forms. We do so through a multi-sited ethnographic study of divergent more-than-human temporalities in the redevelopment of informal green spaces in two post-industrial European cities. Specifically, we look to the regeneration of abandoned and decaying riparian zones in Gothenburg, Sweden, and Turin, Italy, as fruitful sites for exploring how diverse temporalities expose the tensions between municipal planning imperatives and more-than-human relations. Drawing on the work of philosopher Chantal Mouffe, we develop the concept of agonistic temporalities to theorise these confrontations as inherently pluralistic and productive for the politics of planning the more-than-human city.
Introduction
In recent decades, urban nature scholarship has provided illuminating entry points to examine the biophysical, aesthetic, political and socio-economic transformations of cities (Clark et al., 2016). Today, in the face of the current environmental crises, both public and political discourses express an increasing urgency to enhance existing metropolitan green spaces (Vandecasteele et al., 2019). Indeed, urban natures are purported to address a multitude of essential city services such as recreation, climate mitigation and biodiversity enhancers (Niemelä, 2014). However, contemporary urban green spaces are often highly diversified due to site-specific evolutionary and historical peculiarities (Derkzen et al., 2017), which complicate catch-all attempts at theorising socio-natural environments, developing practical planning solutions or promoting a comprehensive politics for the more-than-human city. Across disciplines and practices, from the natural sciences (Ossola et al., 2021) to planning (Degen, 2018: 1082–1083), there have been tentative attempts to address this by moving beyond the focus on urban natures’ immediate spatial imprints. Time and temporalities, they propose, play an important yet underdeveloped part in understanding the plural effects that urban natures have on everything from design and management practices, to use and access of urban space. This article adds to this emerging canon by homing in on the other-than-human temporalities of urban natures that diverge from the linear and spatially focused planning praxis of most post-industrial cities.
Though the study of more- and other-than-human temporalities started to gain traction decades ago (Adam, 1998; Bastian, 2009; Jones, 2011; Wood, 2008), much scholarship on urban natures still concerns spatial relations and tensions – that is, how the more-than-human city is ‘put together’, and thus made habitable, in terms of productions of space, urban metabolisms and assemblages, urban governance and so on (Kaika et al., 2023). When temporalities are addressed, it is mainly through a narrow focus on temporal taxonomies drawn from ecological systems research (Hastings, 2010), social constructivist approaches (Urry, 2006) or urban development and planning conceptions of linear progress (Hawken et al., 2025). Recent more-than-human scholarship has sought to expand the notion of ‘urban natures’ (Edwards et al., 2023): from feral (Barua, 2022), queer (Patrick, 2014) and ruderal ecologies (Stoetzer, 2022), to infrastructural flora (Jasper, 2020), plant labourers (Argüelles and March, 2022; Ernwein et al., 2021) and more-than-human commons (Haldrup et al., 2022). But again, most accounts – with a few exceptions (see for instance Dümpelmann (2025) on urban trees as ‘timekeepers’) – do not problematise the diverging and other-than-human temporal dimensions found in cities.
In his seminal reflection on temporal landscapes, anthropologist Tim Ingold teases out a distinction between time and temporality. Time is chronological, such as the Earth’s axial rotations and revolutions around the sun – thus ‘wholly indifferent to the modulations of human experience’ (Ingold, 1993: 158). Temporality is social in that it is ‘grounded in the “rhythms, pulsations and beats of the societies in which they are found”, and for that reason tied to the particular circumstances of place and people’ (Ingold, 1993: 158). The latter definition is frequently used by planning scholars to underscore the need to approach time in its plurality (Degen, 2018; Raco et al., 2008), as it draws ‘attention to how the temporal frames used in planning are not given but are chosen from a plurality of options’ (Lennon and Tubridy, 2023: 302). Just like space, they argue, this latter kind of time is a social product (Addie, 2025) tied to the human politics of urban planning (Laurian and Inch, 2019). However, what goes missing in these accounts are the temporalities of other-than-human beings and matter, which emerge independently, in parallel or in opposition to human city planning. For, if we abide by the more-than-human cornerstone notion that the ‘concept of sociality does not distinguish between human and not human’ (Tsing, 2013: 27), then temporalities as social products must too be approached as an inherently more-than-human matter. Consequently, to adequately account for the politics of the more-than-human city in urban nature planning, both our repertoires of space and temporalities need expanding beyond the human.
To include other-than-human urban temporalities, we propose, does not mean side-lining spatial considerations. Rather, it highlights traits of time in relation to space and vice versa. As we have argued elsewhere (Barchetta, 2021; Rosengren, 2020), to trace urban change in spatio-temporal forms that go beyond a strictly linear, anthropocentric trajectory is key to recognising and broadening attention to the diverging multiplicities that constitute the more-than-human city (Houston et al., 2018). In this article, we argue that the frictions, tensions and confrontations that more-than-human temporal processes give rise to are fundamentally productive towards understanding more-than-human urban pasts and presents, while also building more progressive and inclusive planning politics for socio-ecological futures. Specifically, our article adds to debates on the politics of planning the more-than-human city through a comparative ethnographic study of the temporal confrontations arising from the regeneration of ‘decaying’ green spaces in two post-industrial cities in Europe. Drawing on philosopher Chantal Mouffe’s (1999, 2005, 2007, 2013) writings on agonistic democracy, pluralism and public space, we introduce the concept of agonistic temporalities to theorise the fundamentally plural and polyvocal dimensionality of time in shaping urban natures and planning strategies. Through two empirical snapshots – Arrivore Park in Turin, Italy, and Kvillepiren in Gothenburg, Sweden – this approach reveals how inorganic matter of copper, rubber or arsenic might contribute to the safeguarding of both spontaneous and planted ecologies in areas facing redevelopment, all the while showing how these urban ecologies of ‘weedy’ birches, endangered pondweeds or ‘sabotaging’ Chinese mugworts put into question anthropocentric notions of progress through their very persistence in the changing landscape.
In short, by unveiling the multiple temporal confrontations of urban green space redevelopment, we point to the need for a broader theorisation of the temporalities of urban natures in city planning and more-than-human urban scholarship alike. In the second section, we outline the ethnographic methods adopted and stress the gains in comparing the two cities. In the third section, we consider post-industrial urban natures as entry points to develop the concept of agonistic temporalities. In the fourth and fifth sections, we delve into our two empirical studies, using them in the sixth section for our ultimate analysis of agonistic temporalities of urban natures. In all, through letting agonistic temporalities nuance and sharpen existing more-than-human urban theory, we challenge the conventional view of urban nature temporalities as part of straightforward, linear narratives, and highlight how decaying green spaces may serve as catalysts for a different politics of the more-than-human city.
Analysing apart and together: Ethnography and experimental comparisons between Turin and Gothenburg
Multi-sited ethnography in more-than-human cities
The empirical foundation of the article rests on our respective ethnographic studies of spontaneous urban green spaces. Carrying ‘beings of one world into another one’ (Pandian and McLean, 2017: 1), ethnography’s aptness to take on more-than-human worlds (Kirksey and Helmreich, 2010) has been showcased in a range of environs – from human–animal communication in the Amazon (Kohn, 2013) to human–fungal relationships in Japan (Tsing, 2015). Our article joins this eclectic canon not simply by establishing Gothenburg and Turin as more-than-human sites of research but also by explicitly homing in on the capacity for a multiplicity of other-than-human temporalities to shed new light on urban natures planning and politics. Ethnography’s ability to capture ‘contingent and layered processes, practices, and projects of human and more-than-human inhabitation and belonging in cosmopolitan urban spaces’ (Poe et al., 2014: 902) is highlighted in this multi-sited form in order to reach beyond typical dichotomies of ‘urban/rural’, ‘nature/culture’ and ‘mechanical/ecological time’ (Marcus, 1995). Our specific multi-sited approach derives from the comparisons between our respective field sites, helping us resist the abovementioned dichotomies as well as anthropocentric urban boundaries and national borders.
Turin and Gothenburg as ethnographic field sites
Between January 2017 and June 2018, Barchetta carried out ethnographic research on post-industrial riparian landscapes targeted for regeneration along the River Stura in Turin, Italy, to explore how planning and agroforestry professionals, local allotment gardeners and other ordinary users experienced and valued these transitional spaces. A mixture of qualitative research methods – from ethnography, archival research and media discourse analysis, to participatory walking practices – was employed to examine how time shapes the riparian environments and how different actors perceive urban change. 1 Alongside field notes (audio recordings, written notes and photographs), archival material (maps, articles, photographs and home movies) was consulted to reconstruct Turin’s environmental history, and the social imaginary of its green spaces. The data revealed distinctive historical, social and ecological trajectories within Turin’s post-industrial riverine landscape. Arrivore Park emerged as a compelling case as it did not align with the riverside regeneration projects celebrated in the municipal narrative of post-industrial transformation. Instead, it represented an alternative to, and a more conflicting case of, riverside transformation.
Rosengren conducted ethnographic fieldwork in Gothenburg, between September 2016 and October 2017, as part of a wider project on more-than-human urban wastelands in Gothenburg, Sweden, and Berlin, Germany. One such wasteland, Kvillepiren (the Kville pier), forms this article’s second case study. The research followed a qualitative mixed-methods methodology, employing classic ethnographic methods of participant observation, semi- and unstructured interviews and walk-alongs with urban planning professionals, activists and citizen groups, as well as field diary keeping (text, image and sound). 2 Aside from municipal planning documents and ecological surveys, Rosengren consulted a patchwork of municipal archival sources including newspaper articles, old maps and photographs. This archival mélange helped both to situate Kvillepiren in the linear, historical narrative of the city and to trace diverging temporal relations within – when the most recent growth of spontaneous vegetation began, when the area’s material decay came to matter in the municipal planning process, etc. For this article, Kvillepiren is particularly intriguing as it became a municipal testing ground for a new, successional post-industrial planning approach.
Comparing temporalities of urban natures
The two empirical studies diverge on many accounts – geographical, ecological, socio-political, cultural and historical. Yet, in the enmeshed temporalities of urban natures – municipal and informal, human and other-than-human – there are literal and conceptual common grounds. The decision to compare Turin and Gothenburg derives from our joint interest in studying urban natures from an expanded temporal perspective – aiming to address the overlapping crises confronting cities in the Anthropocene. 3 This approach emerged organically as we delved into the details of our respective research and discovered a rich empirical landscape of social, ecological and political-economic challenges facing both cities. The comparison revealed parallels and contrasts between Turin and Gothenburg, but especially the complex temporalities at play in the regeneration of informal green spaces.
Reflecting a common narrative in postwar Western Europe, both cities have experienced similar trajectories with swathes of their urbanised areas shifting from important industrial zones to indefinite post-industrial landscapes of waste and decay (Jorgensen and Keenan, 2012). Comparing our field sites, we found these landscapes similar in how time and municipal temporalities had transformed them, and the alternative temporalities that emerged in the process. This intersection came to a head in how both municipalities had sought to reinscribe these areas into the urban fabric by ‘greening’ them into parks and allotments. Furthermore, these conversions were particularly affected by the contrasting and conflicting temporalities of local natures and inorganic matter. It is through this exchange that the concept of agonistic temporalities emerged as a valuable analytical tool, allowing us to better foreground the tensions of planning politics between different temporal frameworks in each space targeted for urban redevelopment.
Working with occasionally lopsided case studies, our contribution follows urban geographers Michele Lancione and Colin McFarlane’s (2016) notion of ‘experimental’ urban comparisons. They show that using a set of ostensibly ‘incomparable’ cases may in fact reveal salient contextual readings that more superficially balanced comparisons might have struggled to uncover. Comparison, they contend, ‘is about learning from the specificity of each case while at the same providing generalisations that orient critical thinking in relation to context’ (Lancione and McFarlane, 2016: 2418). What sets this ‘experimental’ stance apart from other comparative urban approaches is that it aims – much in line with agonistic thought – to simultaneously reveal interlinkages and differences: ‘compar[ing] not so much cities but the everyday making of specific urban processes’ (Lancione and McFarlane, 2016: 2404). The cases in this article embody just such diverse urban processes. As such, our aim is not to compare how urban nature planning plays out in different contexts but rather to analyse how complex temporalities coalesce in and around green spaces whose future is open to contestation. By doing so, we seek to underscore the situatedness and interconnectedness of these temporal trajectories – from past industrial uses and formal abandonment to contemporary post-industrial planning politics of dense and green urban landscapes.
A politics for the more-than-human city: Theorising agonistic temporalities
From agonistic space to agonistic temporalities
To concretise the more-than-human politics that the diverging temporalities of urban natures afford, we take inspiration from Chantal Mouffe’s (2007, 2013) concept of ‘agonistic public spaces’. Mouffe’s notion of agonistic space rests upon her overarching concept of ‘agonistic pluralism’ – that a democratically astute society relies upon the presence of confrontations. The potential for contestation and irreconcilable difference, she argues, is in fact fundamental to the very constitution and maintenance of democracy itself. As Mouffe (1999: 755–756) writes: Contrary to the model of ‘deliberative democracy’, the model of ‘agonistic pluralism’ that I am advocating is that the prime task of democratic politics is not to eliminate passions or relegate them to the private sphere in order to render rational consensus possible, but to mobilise those passions towards the promotion of democratic designs. Far from jeopardizing democracy, agonistic confrontation is its very condition of existence.
Agonism thus purports a ‘public space … where conflicting points of view are confronted without any possibility of final reconciliation’ (Mouffe, 2013: 92). Mouffe’s focus lies predominately on Western liberalism’s obsession of positing rational political consensus as the backbone of democracy. This, she argues, fails to grasp the ‘pluralistic nature of the social world, with the conflicts that pluralism entails; conflicts for which no rational solution could ever exist’ (Mouffe, 2005: 10). The delegitimisation of conflict in liberal politics, Mouffe asserts, instead feeds into simplistic, antagonistic lines of thought – much coopted by far-right political movements. In short, democracy without any legitimised confrontation will always falter, fostering either a society of prescriptive consensus culture or illiberal dogmatism. Performing an always-in-the-making balancing act between the two, Mouffe’s (2007: 3) agonistic approach works to keep both extremities at bay by acknowledging that ‘confrontation takes place in a multiplicity of discursive surfaces’. It is from this relational, plurality of surfaces that, according to Mouffe, any truly democratic order and political agency may emerge.
Admittedly, adopting an agonistic approach does not come without certain pitfalls. For instance, the notion of a fixed, consensus-based public space, which Mouffe’s theorising relies upon, has been upended by recent urban studies and post-political scholarship (Mehta and Palazzo, 2023; Wilson and Swyngedouw, 2014). Here, we believe, a pivot towards other-than-human beings and temporalities allows agonistic thought to better align with a promise of democratic pluralism emerging across multiple scales of political action, confrontation and persistence: though Mouffe’s agential focus lies on the location of politics – the space in which it gets activated and circumscribed – many foundational debates in socialist politics have explicitly attempted to grapple with the political dimension of time, such as ‘socially necessary labour time’ (Marx, 1976), ‘free time’ (Adorno, 1991) or ‘the right to be lazy’ (Lafargue, 1999). Yet, political contestation over time, who owns it and how it is used, are necessarily defined by who makes claims to and defines it (Osborne, 1994). And for most urban political scholarship these claims have been resolutely anthropocentric, hindering the development of an encompassing more-than-human planning politics of the city. Consequently, we cannot properly account for who is included in the shaping of urban space if we do not also account for the diversity of temporalities that underpin the demands of the parties involved. Thus, Mouffe’s notion of the political, and the agonistic agencies therein, remains limited so long as the temporalities of this political agency are left unaddressed (cf. Brice’s (2014) astute reflection on the temporalities of vegetable labour in capitalist viticulture). In this context, our notion of agonistic temporalities adds to Mouffe’s political philosophy by asking who has the right to persist in urban landscapes, extending this view to include not only human actors but also the political agency of plants and inorganic matter.
Other-than-human agency and agonistic temporalities of urban natures
Approaching urban green spaces as an entwinement of discursive surfaces that includes both human and other-than-human abilities to act underscores the validity of agonistic pluralism in both space and time, providing a salient theoretical framework to bridge other-than-human temporalities and agencies. As philosopher Michelle Bastian (2009: 101) points to in her more-than-human reading of anthropologist Carol Greenhouse’s musings on time and agency: accounts of time and agency are not mutually exclusive; rather there are always multiple ways of living time within any particular society. However, where one specific idealisation of time becomes hegemonic, this notion will also guide the hegemonic notion of agency.
The ‘specific idealisation’ of linear time that dominates popular discourse on urban change in the West is tightly bound up with how Western municipalities view ‘nature as an object of production’ (Smith, 2008: 71), enforcing a linear capitalist trajectory of successive stages of urban growth: from ‘abandoned’ and ‘unproductive’ wastelands to ‘redeveloped’ and ‘productive’ green spaces (Hawken et al., 2025). Subsequently guiding municipal urban nature imaginaries and practices, this mirrors Mouffe’s (2007: 5) critique of how the ‘hegemonic nature of any form of consensus’ undermines any truly diverse and democratic agential potential, in the city and elsewhere.
Furthermore, the agonistic approach exposes a present contention around the notion of agency within most more-than-human scholarship. The entrenching of agency beyond the human has been fundamental for the development of multispecies, new materialist and post- and more-than-human studies (see Barad, 2011; Bennett, 2010; or Haraway, 2016). To establish agential qualities in both beings and matter has, to a certain extent, become the means for scholars to grant validity to the other-than-humans that they study. Yet, as the inclusion of animal and plant agencies has gained traction within everything from the humanities (Ryan, 2012) to urban design practices (Rosén et al., 2024), we sense a propensity within more-than-human research to, on the one hand, augment and romanticise notions of more-than-human cooperation or conviviality, and, on the other, ardently seek out examples of other-than-human ‘resistance’. When looking at decaying urban green spaces, neither position, we contend, adequately responds to the empirical intricacies of beings, matter and actions found therein. The former risks an ontological flattening, which in theory holds a lot of intellectual sway (again see Barad, 2011 or Bennett, 2010) but easily loses any critical precision, obfuscating hierarchies of power, planning and politics, when applied without distinction. The latter, conversely, inadvertently risks falling into the trap of binary, or antagonistic, thinking: pitting human against other-than-human; formal against informal; urban against nature.
In light of this ‘agential crux’ that more-than-human scholars are facing, moving a humanist philosopher into decidedly socio-ecological and post-human territory proves far less of a leap than it first may seem. Though Mouffe herself never really veers from an exclusively human conceptualisation of the public and the political, she has inspired agonist theorists who are edging closer to the more-than-human realm. Political theorist Amanda Machin (2020: 168) develops an ‘ecological agonism’ to posit (human) political actors as ‘ecologically situated living beings affected by policy in different ways … [to] better understand the disagreements that inevitably arise over environmental politics to both disturb and enliven politics’. Seeing the environmental challenges in the Anthropocene, Machin (2019: 357) also emphasises how ecological agonism may constructively inform temporal perspectives to ‘uphold the possibility for disagreement and struggle between a plurality of different perspectives, conditioned in different ecological realities and embodied practices and articulated by political actors who are not determined by any essential predisposition’. Here, as we advance this proposition further by including other-than-human beings and matter as such political actors, the agonistic approach invites us to think across scales, temporalities and agencies without losing touch with the specificities of our empirical examples.
Firstly, it allows us to approach urban nature conflicts without falling back on binaries such as ‘good/bad’, ‘progress/decay’, ‘city/nature’, ‘development/decline’ etc. Secondly, we may address multiplicities, difference and other-than-human agency without losing sight of the complex power hierarchies involved in ‘the everyday making of specific urban processes’ (Lancione and McFarlane, 2016: 2404). In this light, the salience of Mouffe’s (and Machin’s) theorising is as true for the deliberation of humans as it is for considering the potential for more-than-human democratic designs, theoretical and practical, in urban environments. And as such, it helps us align other-than-human beings and matter with the empirical complexities and incongruities presented in the post-industrial natures of Turin and Gothenburg.
The politics of agonistic temporalities in post-industrial urban natures
In sum, agonistic temporalities are those that confront, disturb and provide alternatives for temporal hegemonic assumptions that influence the politics of both urban space and being. Examples of such temporalities at play may be found in most post-industrial urban landscapes, but perhaps particularly in green spaces generated by industrial decay or abandonment. By defying expected imaginaries ascribed to municipal nature, such decay emerges as a ‘deforming vibration of [more-than-human] matter’ (Pavoni and D’Alba, 2024: 23) that ignores human plans and intentions. For instance, anthropologist Anna Tsing (2015) explores decay as a fundamental ecological and social aspect of capitalist practices of exploitation and abandonment. Her ethnographic study of the matsutake mushroom, which thrives in human-disturbed forests, posits decay not merely as a negative or destructive force but as an emergent ecology that generate opportunities for new forms of life and growth, interfering in a very agonistic manner with capitalist ecologies of industrial agroforestry and global consumer markets. Thus, by developing the notion of agonistic temporalities, we highlight how various actors and elements confront and persist in different situated forms of urban green space redevelopment and overall contemporary city planning politics. Our approach questions prevailing urban nature scholarship that remains preoccupied with an overemphasis on space and space-making, as much as it challenges a decontextualised romanticisation of coexistence and conviviality found in much more-than-human scholarship. Moving beyond this theoretical proposition into our two field sites, in the following sections we present various other-than-human temporalities that show what this agonist, more-than-human urban politics may look like in practice.
Post-industrial decay and regeneration on the edges of the Stura
The edges of the Stura River in Turin tell both familiar and unique stories about the intersection between urban change and the seasonal and socio-ecological life of urban green spaces. 4 The river evokes an uneven history and geography of the city: from an agricultural zone to a manufacturing hub, from an industrial wasteland to a recreational area where spontaneous and cultivated vegetation coexist. Arrivore Park, in the northeastern periphery of Turin, surrounds the river. Originally, the Stura basin was a vast field of wheat, meadows, and marshes that functioned as a transition zone between the city and its outskirts. Until the mid-1960s, part of the land was used to cultivate cereals and fodder, while the Stura’s banks served as a popular destination for Sunday picnics, giving rise to local restaurants and other businesses. From the 1970s onwards, the basin experienced intense exploitation with the industrialisation of the local economy and the digging of numerous quarries. Gravel extraction dredged from the riverbed for construction and road paving still remains visible and, as late as the 2010s, residents recalled their parents forbidding them from playing near the overgrown and weedy banks of the Stura.
With industrialisation, subsidised housing estates designated for factory workers were built in nearby districts. These workers began renting plots of land on which to grow vegetables, herbs and other plants from their home regions. Many were migrants turned workers (operai), who had moved from the South to work in the industrialised North. From the 1940s onwards, these southern émigrés thus began growing fruits and vegetables on acres of state-owned land along the edge of the Stura as an after-work activity, fostering a sense of autonomy and economic livelihood. This working of the soil brought together leisure and subsistence farming with the histories of economic growth and internal migration in the post-Second World War period. Shacks built from recycled material exemplified the architectural features that populated these spontaneous vegetable gardens, where gardeners installed handcrafted water pipes and barriers, and built temporary shelters to store tools and protect themselves from the rain. By the 1970s, however, the area increasingly came to symbolise the adverse effects of deindustrialisation. Scrapyards, shacks, industrial dumps and high unemployment became prevalent. A patchwork of allotment gardens and scrapyards progressively emerged, displaying two colourful sides of the industrial riverbank – the ‘reddish-brown’ of wrecked cars and the ‘greyish-green’ of garden plots. In the 1980s and 1990s, an uptick in international migration to Turin and the densification of affordable and public housing estates in and around the Stura Basin led to a complex, if not contentious, coexistence between established residents and newcomers (Garda et al., 2015).
Over time, stigmas associated with the Basin grew; it became known as a ‘fragile’ periphery in popular discourse, which reflected the social and ecological impacts of post-Fordism. In response to these concerns, just before the 2008 financial crisis, redevelopment began with the Turin City of Waters project. When Arrivore Park opened in 2010, urban allotments were assigned to gardeners, symbolising a step towards reclaiming and revitalising the peripheral riparian zone. The park marked an end to the makeshift gardens that the southern migrants and factory workers had cultivated over the previous 40 years. The municipality stepped in as the official landlord, renting out each parcel of land to laypersons, yet from the very beginning it fell to the gardeners themselves to remove mounds of rocks and rubbish – dishes, pieces of tyres, copper – from the plots. Today, this large green space remains fragmented, with dedicated park areas, playgrounds, ruderal vegetation, urban allotments and riverine habitats intermingling. Nevertheless, over the years, inadequate management, fears of crime and mistrust in the maintenance of the natural landscape have limited its full integration into the city’s riverside network and contributed to negative perceptions of the park. As a 79-year-old municipal allotment gardener recounts:
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I was part of the first group allowed to cultivate vegetable allotments. I knew this place because some friends grew vegetables there [pointing to the hill]. The municipal gardens were set up after the scrapyards, and the Roma settlement was dismantled. Each plot was rented out by the city, but, since it was the very start of the allotment project, we had to clear rocks and rubbish ourselves. It was hard work! I found all kinds of waste while digging: dishes, knives, tyres, copper. It still happens today.
The gardener’s account reveals the layers of waste embedded in the landscape, reflecting how time shapes the overlapping, conflicting temporalities at the site. In these industrial remnants, informal agricultural uses of the past and present persist along the riverbanks: fruit trees and tomato plants pop up in unexpected places, and some sites have been reforested as part of private compensation programmes with common trees of lowland thickets from the Po Valley. Furthermore, northern Italian riparian habitats are particularly prone to invasion by non-native, ruderal plants, notably Japanese knotweed (Reynoutria japonica), butterfly bush (Buddleja davidii) and Chinese mugwort (Artemisia verlotiorum) which quickly colonise and thrive in bare or disturbed soils. During walks, park visitors often paused to observe the dense growth of Chinese mugwort and enjoy the distinctive scent of its leaves. A local environmental educator calls this plant sabotatrici dell'ordine, or ‘saboteur of order’. 6 For her, this ‘sabotage’ hinted at the potential for a different kind of green space. For us, it also serves as a lens to understand urban natures as co-constructed across multiple temporalities. Such temporalities enacted by rewilding projects include those of native riparian wilderness represented by species like purple willow (Salix purpurea) and black poplar (Populus nigra), as well as ruderal and horticultural vegetation. In 2024, the City of Turin and Turin Polytechnic launched a collaboration to envision a new design for the park that focused on reconnecting with its distinctive flora. As of now, it is unclear whether these plans will be implemented, revised or abandoned, but the everyday perception of the park’s ‘naturalness’ or ‘wilderness’ nevertheless often leads to confusion, or is simply overlooked.
Arsenic, weed trees and aquatic plants at the harbour wasteland of Kvillepiren
Our second site, Kvillepiren, evokes similar temporal constellations working to the advantage (or disadvantage) of certain municipal visions, and human or other-than-human beings. Kvillepiren is the largest of the three piers that make up the former free port area of Frihamnen (the Free Harbour) in Gothenburg. Situated in the middle of the Göta Älv river mound – the river cutting through the city – the harbour is a completely artificial construction built on what 150 years ago was a shallow water reed landscape with a rich bird biotope (Öhman, 2004: 23; Karlsson, 1955: 2–4). The harbour’s two southeastern piers were constructed in the beginning of the 20th century, in the early heyday of the city’s modern harbour industry, which expanded with Kvillepiren in the post-war period. In the mid-1990s, the free port lost its intended function when Sweden joined the European Union and its common market (Öhman, 2004: 25). With the end of the free port era, as well as the continuous decline of the shipyard industry around it, much of Kvillepiren soon fell into disuse.
During this period, as Kvillepiren’s asphalt and steel began their slow process of decay, a set of early succession pioneer plants expanded at the pier’s end and surrounding edges (Frid, 2015: 30). In time, this organic constellation would provide an intriguing example of how diverse temporalities of urban natures interact and conflict during post-industrial decay and regeneration processes. In the early 2000s, the municipality of Gothenburg decided to redevelop the area into a dense, residential neighbourhood. Interestingly, this project was set to happen over time, through the municipality vying to adopt an experimental, so-called ‘successional conversion of space’ that put the temporal aspects of redevelopment in focus (Dahl et al., 2019: 7). The stipulated hope was that this would encourage new (human) interactions with the area, which the until-now privately run harbour had cut off from the surrounding city.
Local urban nature activists, however, were concerned that the spontaneous plant- and wildlife was threatened by municipal plans to redevelop the area. 7 In the summer of 2017, while preparations for redevelopment were well under way, a multitude of ruderal plant species were still thriving in scattered rubble piles and gravelled grounds, and tall reeds were lining the water edges alongside a mélange of white willows (Salix alba), great sallows (Salix caprea) and silver birch trees (Betula pendula). Furthermore, these pioneer plants were not alone in appropriating the pier. Various bird species sheltered in the reeds, and rabbit burrows could be spotted in the rubble piles. Though the area was fenced off from the public, laypeople had still managed to find ways to get in. On fair summer days, people picnicked on the old docks or used makeshift fire pits made from abandoned concrete slabs.
In designing for the area’s ‘successional conversion’, the municipality made a clear allusion to these ‘organic’ temporalities and informal, spontaneous appropriations of urban space. Yet, in many ways this was a shallow mimicking of a plural, more-than-human city, and the temporalities that confronted the initial visons of the planners are testament to this. For one, the old industrial grounds of the pier contained high levels of arsenic that undermined the associated housing plans; arsenic being, in one planner’s words, ‘not very compatible with a [children’s] playground!’.
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The levels were especially high in the areas with dense spontaneous vegetation, as these sites had functioned as informal ‘dumping grounds’ for adjacent industries for decades.
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Consequently, as it could take thousands of years for arsenic to naturally degrade in the soil, the municipal planning office had to bend to the chemical temporalities of toxic decay and chose to turn the spontaneous plant life at the end of the pier into a landscaped park, rather than integrate it into the dense neighbourhood projected in the other parts of Kvillepiren. As one planner heading the area’s redevelopment put it:
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The idea is that we will try to maintain as much of the existing vegetation as possible […] The problem is that the grounds are polluted, so there’s kind of an antagonism in that to be able to open up the area we need to, eh…The traditional way is to just remove everything and put in new soil. Again, that costs tons of money and then you lose just that vegetation that is [already] there…But we have been working with the [municipal] environmental office to try to find a balance there and now I think we’ll be able to keep most of the trees, at least …
Despite the planner purporting to espouse a ‘biodiverse’ and ‘green’ approach, the long-term intentions and realisation of the park were less certain. When looking at past decades’ plans and reports of Frihamnen’s redevelopment, what becomes clear is that the focus on the pier has shifted significantly. In the early 2000s, Kvillepiren had been projected as part of a public park – spanning all three piers with an eco-duct connecting them to larger green areas on the northern riverbank (Dahl et al., 2019; Höstmad, 2013). However, by the mid-2010s, this ambitious park and green infrastructure had been replaced by plans for dense residential blocks and the less nature-focused concept of an allmötesplats (a ‘meeting place for all’). Now green space was only relegated to the tip of Kvillepiren (largely thanks to its polluted soil –Dahl et al., 2019: 49). 11 The official language reflects this side-lining of spontaneous urban nature: the ligneous collectives were sometimes referred to as ‘birch weeds’ (björksly; Frid, 2015: 30), other times as an imprecise ‘post-industrial biotope’ (Älvstaden, 2016: 10), and an in-depth 2019 report devotes only half a page to the so-called ‘urban ecologies’ (urbana ekologier), for which the term and its proposed biodiversity are never defined (Dahl et al., 2019: 49).
In the process of turning decay into development, much of the original, spontaneous vegetation would also be replaced by a ‘new structure of trees, shrubs and herbs’ (le balto & Mareld, 2016) – meaning, easier-to-control specimens and temporalities. In 2017, the ‘post-industrial biotope’ of weed trees still played an important role – as an aesthetic backdrop with functional qualities – in the successional conversion of the area. However, in a similar manner to geographer Renate Sander-Regier’s (2009: 68) reflection on plant agency in private gardens, though the weed tree ‘initially serves a desirable purpose … with time and incessant activity, the plant becomes invasive and undesirable – another weed’. Furthermore, since 2011 there had been no mention of the endangered aquatic plant knölnate (Potamogeton trichoides), or ‘hairlike pondweed’, which in Sweden exists only in Gothenburg (SBK, 2011: 48). It had been recorded near the northwestern bank of the pier for over 100 years – making do in the sweet water mouth and adjoining stream throughout the harbour’s development and decay. This omission of both spontaneous ecologies and endangered species indicates that the vegetation of the pier was being appreciated not for its own qualities and demands but because it formed part of a municipal vision for building a green and dense city – void of decay, waste and any diverging other-than-human temporalities.
Agonistic temporalities of other-than-human persistence in Turin and Gothenburg
Our examples show that when urban nature temporalities are conceptualised not just as single, linear and fundamentally anthropocentric events but as continuous, sprawling processes – be they spontaneous, ‘decaying’ or otherwise – they emerge as crucial sites of confrontation for more-than-human urban politics. What crystallises from this comparative foray of post-industrial green space regeneration is a novel understanding of how alternative, agonistic temporalities come to matter in redirecting municipal action and exposing hegemonic urban nature imaginaries. Though hardly embraced by the municipal authorities in our respective field sites, we propose that how these temporalities clash and coalesce is essential to cultivating a more agonistic and pluralistic politics of the more-than-human city.
For one, agonistic temporalities emerge when interrogating the legacy and durability of contaminants from the historical mismanagements of solid waste of the industrial harbour in the Göta Älv and the steel plants of the automotive industry along the Stura. During Kvillepiren’s redevelopment from a closed-off wasteland to a future sought-after inner-city neighbourhood, facile narratives of linear progress had been unsettled through the temporal persistence of the long-term toxicity of inorganic degradation. The time (and money) it would take to de-toxify the soil from arsenic have forced a significant change to the exploitation plans of the area – from residential neighbourhood to urban park. At the same time, in the ‘chemical landscape’ of old waste and industrial matter at the Arrivore Park, past and present informal agricultural uses along the riverbanks challenge municipal guidelines on what formally should be too polluted a ground to cultivate. Consequently, even in officially condoned land uses, such as the allotment, temporal confrontations remain. As the old gardener conveyed, here the soil is full of matter, displaying temporalities of decay that ignore notions of agricultural decomposition and question the area’s official designation as cultivable, ‘productive’ land. Through these agonistic temporalities of material decay, we detect how municipalities rely on the labour of humans and plants alike (Ernwein et al., 2021) to render polluted urban sites ‘harmless’ or integrate them into the official fabric of the city (de Waal and de Wit, 2011): either by creating an urban park, like in Kvillepiren, or by establishing municipal allotments as in Arrivore Park.
Secondly, this toxic and material waste points to a material excess that often intermingles with, if not encourages, ‘unplanned’ urban natures (Pavoni and D’Alba, 2024). In their work on Satoyama forests in Japan – where the coordination of temporal rhythms of plants, people and matter is key to fostering liveable multispecies worlds – Tsing and artist-theorist Elaine Gan stress how temporalities are instrumental in understanding how things hold together more-than-human interdependencies (Gan and Tsing, 2018). In Turin and Gothenburg, the excess of toxic matter and other objects, along with many plants’ tenacious character, underscores the temporal agonism created between the more-than-human trajectories of informal and formal gardens, spontaneous vegetation and urban planning and the breakdown of waste in the urban environment. This temporal agonism is inherently context specific and unveils the problematics when municipal workers and laypeople mistakenly interpret the ‘things that hold’ as waste or weeds within the transformation of green spaces. Here, agonistic temporalities highlight, and subsequently question, what is perceived as legitimate use of urban space, and who (human and other-than-human alike) is perceived as a legitimate user. They point to how temporalities of other-than-human beings and matter rub against human temporalities to the extent that they must be recognised, and accommodated for, by municipal planning professionals, individual urban dwellers and urban nature theorists.
Thirdly, the capacity for toxic and inorganic temporalities to influence urban planning strategies to involve the ‘detoxifying’ labour of plants also makes another kind of agonistic temporality visible: those planty temporalities that persist despite the hegemony of a ‘specific idealisation of time’ (Bastian, 2009: 101) in urban planning. As our studies in Gothenburg and Turin reveal, the persistence of spontaneous or informal natures paves the way for a multitude of plants to thrive alongside processes of urban decay and abandonment. In a simultaneously theoretical, empirical and political confrontation, they expose what geographer Robert Dodgshon (1999: 615) calls the ‘principle of persistence’, how complex pasts ‘carryover from one moment to the next’ to influence the future. In the case of our post-industrial urban landscapes, persistence ushers ‘disjunctured’ ecological and industrial pasts into the present to interfere with future urban planning.
The plants at Kvillepiren and Arrivore Park persist because of their ‘insurgent’ biological characteristics (Argüelles and March, 2022: 55) – their capacity for rapid growth, phenotypic plasticity and prolific seed production and dispersal, their tolerance to disturbance and contaminated soils and waters and their adaptability to harsh urban conditions. This persistence – either by ‘weed trees’ and pondweed at Kvillepiren or in the intermingling of native plants and non-native ‘saboteurs’ in Arrivore Park – exposes biological processes of decay and regeneration that are so incompatible with municipal visions that they are simply ignored or, if this is not possible, are incorporated as ‘managed’ urban ecologies to fit certain municipal imaginaries. Geographer Robert Francis (2018: 153) calls such managed ecologies ‘ecological simulacra’; that is, ‘a stylised representation of an ecosystem that people can utilise while bypassing the need to acknowledge or interact with other species entirely’. In the simulacra of Kvillepiren and Arrivore Park, spontaneous vegetal growth and decline are brushed over by municipal plans to accommodate more linear notions of progress – much in line with the anthropocentric, ‘hegemonic consensus’ (Mouffe, 2007: 5) of how both time and natures are to be perceived in the city. Nevertheless, if one looks closer, the permanence of the pondweed or the tenacity of the Chinese mugwort in the face of both post-industrial decay and redevelopment, exemplifies how the imprint of a more-than-human urban politics is borne out of unassuming, temporal persistence.
Conclusion
The stories of decaying materialities and persistent plants illustrate several ways that diverging, other-than-human temporalities may come to matter in the planning of urban space. They highlight how their very spatio-temporal articulation may be negated, ignored or repurposed to maintain a dominant urban planning ideal and thereby risks being made invisible or written out of current political visions of the city. In this article, we point to a path out of this hegemonic bind, showing how complex temporal confrontations of organic lives and inorganic matter are not just possible but, to paraphrase Mouffe, necessary for a truly democratic imagining and making of more-than-human cities. To recognise other-than-human temporalities in urban decay or redevelopment, we argue, is not only to recognise the plurality of urban temporalities but also to underpin the means by which these rhythms and trajectories are held together in agonistic tension when municipal interests seek to change the urban fabric. Kvillepiren and Arrivore Park expose potential pitfalls in the antagonistic post-industrial imagining of a simultaneously ‘green’ and ‘dense’, ‘ordered’ and ‘biodiverse’ urban landscape. This in turn queries how vegetal life is purported by each municipality, and how it mirrors the ways that urban natures are defined in official municipal narratives.
To conclude, theorising urban natures through the lens of agonistic temporalities shows how municipalities favour shallow, speculative future commitments to biodiversity creation rather than engaging with the spontaneous, thriving natures that are already present. On the one hand, the permanence of toxic and other waste matter secures the existence of urban natures at the field sites themselves, as there is little else that the grounds may be used for. On the other hand, the specifics of these urban natures, in terms of species constellations or biodiversity, remain obfuscated. This is exemplified by the ways that endangered and non-native species are made invisible by either excluding them completely (by intention or oversight) or integrating them as undefined ‘urban ecologies’ in the official planning strategies' narratives. Such simulacra of unspecified, ‘unproblematic’ and controllable ecologies show how urban natures are filtered through various social, political, aesthetic and ecological values of the different redevelopment programmes. Adopting an agonistic temporal approach uncovers the cracks in these imaginations by diversifying how we conceive of urban natures, working towards a truly more-than-human politics of the city.
Footnotes
Acknowledgements
We would especially like to thank the three anonymous reviewers for their insightful suggestions as well as William Kutz for his extensive comments on an earlier draft of the article; you have all significantly improved the end result.
Author note
Authorship is listed alphabetically; both authors contributed equally to the production of the article.
Funding
The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: Rosengren’s research has been supported by the European Research Council Advanced Grant project Rethinking Urban Nature, University of Cambridge, as well as the Formas project Revisiting Allmänningar & Stråk. Spatial Justice in the 21st Century Urban-Rural Land Regime (2019-01923), Malmö University.
Declaration of conflicting interests
The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
