Research & reports

Paris Pencharz, Peter H. Verburg, Pierre Chopin · Landscape and Urban Planning · Europe

This study investigated the conditions enabling urban agriculture (UA) at a 1 km² scale across 11 large European cities. The intercity model suggested that UA is more likely found in greener, central neighborhoods with lower property prices and lower proportions of locally born residents. However, there is not a consistent set of factors implying UA presence, suggesting other social and policy factors might be at play.

Charlotte Gallagher, Daniel López-García, Parisi, Anton, Cuevas, Soledad · Zenodo (CERN European Organization for Nuclear Research) · Europe

An outcome report from strategic workshops in Valladolid, Flanders, and Wrocław, engaging 33 diverse local stakeholders, assessed key policy and governance challenges facing urban agriculture. The most urgent and actionable priority identified across all three regions is the lack of coordination and knowledge sharing, underscoring a critical need to build resilient urban agriculture coalitions. To address broader structural issues like land access, stakeholders emphasized bridging the urban-rural divide, overcoming political short-termism, and establishing a shared understanding of urban agriculture's multifunctionality.

Evangelista et al. · Agronomy for Sustainable Development · Europe

This 8-year case study tracked tomato cultivation in a rooftop greenhouse. Peak yield reached 49 g plant−1 day−1 in the 2023 cycle, but overall yield declined by 31.2% across the 8 years. Best water use efficiency reached 36.8 g/L under reduced irrigation. Solar transmittance dropped from 50.9% in 2015 to 46.4% in 2023 due to polycarbonate degradation, and life-cycle global warming impact rose from a minimum of 0.54 kg CO2eq to 0.94 kg CO2eq in 2023.

Katja Hombrecher · Gefahrstoffe Reinhaltung der Luft · Germany

A pilot study in Germany investigated the impact of road traffic emissions on food plants grown near roads. Bioindicators like kale, chard, Lollo Rosso, and lettuce were exposed for four weeks at four roadside locations and compared to plants in a garden away from roads. While pollutant levels generally did not exceed background or EU maximum limits, significant traffic-related inputs of PAK 4, antimony, aluminum, chromium, and vanadium, and lesser inputs of copper, iron, and lead were detected compared to the control. The findings indicate a potential contamination risk for certain vegetable plants from road traffic.

Mar Loren-Méndez, Celia Chacón-Carretón, Pablo Manuel Millán Millán · ACE Arquitectura Ciudad y Entorno · Spain (Málaga)

This study examines the urban dimension of agricultural heritage, specifically urban orchards, in cities where agrarian activity is deeply intertwined with their origin and evolution. Using Nerja, Málaga, Spain, as a case study, the research highlights that accelerated urban transformation in recent decades has led to a rupture, undermining agrarian logic by abandoning historical growth practices. The study emphasizes the fundamental role of agrarian activity in built environments and advocates for the protection of urban orchards.

Sergi Ventura, J.R. Armengol Miró, David Camacho-Caballero, Enric Casellas, Ricard Segura-Barrero, Alberto Martilli, gara villalba · Urban Climate · Spain (Barcelona)

This study used the Pseudo Global Warming method and WRF model to assess urban heat adaptation strategies in the Metropolitan Area of Barcelona. Three strategies were evaluated: increasing rooftop albedo, implementing irrigated sedum green roofs, and increasing peri-urban agriculture and urban parks. While increasing rooftop albedo provided the greatest daytime cooling (−1.75 °C), and green roofs and peri-urban agriculture showed moderate regulation, none of the strategies fully counterbalanced the projected 6 °C temperature increase by 2100, indicating a limited capacity of these adaptations under severe warming scenarios.

Consell de la Generalitat Valenciana · Diari Oficial de la Generalitat Valenciana (DOGV) / BOE · Spain

A decree-law issued by the Consell (Valencian regional government) on 4 February 2025, published 5 February 2025, amending the 2018 Huerta law and its implementing plan (Decreto 219/2018) to simplify administrative procedures for reconstruction following the 29 October 2024 DANA flooding. It abolishes the Huerta Council and chapters on agrarian development planning and farm inventories, and relaxes urban-planning parameters for agricultural buildings.

Sarah Bell, Charlotte Johnson, Tse‐Hui Teh, Kat Austen, Gemma Moore · · United Kingdom (London)

This chapter explores co-design in developing urban infrastructures, presenting a six-step "Bottom-Up Infrastructure" model. The method was applied to a rooftop garden on a London social-housing estate, intended to function as drainage infrastructure. The case study revealed the potential for co-design, but also highlighted significant constraints on implementation in cities where communities possess limited power and resources.

Géant Basimine Chuma, Jean M. Mondo, Adrien Byamungu Ndeko, Etienne M. Akuzibwe, Espoir Mukengere Bagula, Gustave Nachigera Mushagalusa · Discover Sustainability · Democratic Republic of Congo (Bukavu City)

This study investigated the quantity, composition, and disposal practices of domestic waste in Bukavu City, Eastern D.R. Congo. Findings revealed significant challenges in waste management infrastructure and practices, showing that approximately 5% of waste undergoes composting, while 10% is used as livestock feed, 66% incinerated, and 17% buried. Waste management is primarily handled by children (82%), with very limited involvement from non-governmental organizations.

Ann-Kristin Steines, Michele D’Ostuni, Anna Wissman, Kathrin Specht, Chiara Iodice, Runrid Fox-Kämper, Francesco Monticone, Isabella Righini, Véronique Saint-Gès, Antonella Samoggia, Francesco Orsini · Cities · Europe

This research addressed international and national policies, as well as related constraints and challenges affecting City Region Food System (CRFS) development in six European countries. Data was collected through desktop research, stakeholder interviews, and a workshop. The study found that planning laws restrict possibilities for food production in cities, and legal frameworks prevent the marketing and sale of food produced by non-commercial actors or informal farmers. It also identified a need to expand vocational training in the agricultural sector.

Alexander Follmann, Dorothea Hohengarten · transcript Verlag eBooks · Germany (Cologne)

This publication, titled "Ernährungsrat, Essbare Stadt, Gemeinschaftsgärten: Innere und äußere Logiken und Widersprüche der sozialökologischen Transformation durch Urban Gardening am Beispiel Köln," discusses the internal and external logics and contradictions of socio-ecological transformation through urban gardening, using Cologne as an example. The abstract states that this work was published in "Unterwegs in die Stadt der Zukunft" on page 241.

Catherine Oliver · Transactions of the Institute of British Geographers · United Kingdom (London)

This paper examines urban chicken-keeping in London, where urban spaces are transformed to accommodate chickens. It argues that the human-imposed design of urban barnyards is often impractical for chickens, leading to lawns being torn up, plants demolished, and vegetable patches consumed. Additionally, chickens are vulnerable to local foxes, highlighting that chickens' behaviors and territoriality often overflow their assigned space, challenging human design intentions.

Anna M. Roodhof · Journal of Agriculture Food Systems and Community Development · Netherlands

To map and analyze food forestry (FF) in the Netherlands, a survey of 109 participants and interviews with five experts were conducted, identifying 231 food forests established since 2017. The survey data indicates that while FF initiatives are diverse in goals, few focus on profitability. Practitioners are largely homogeneous, consisting of university-educated individuals aged 40 to 60.

Alberto Matarán-Ruiz, David Fanfani, Josefa Sánchez Contreras, Miguel Ángel Escalona Aguilar · · Central America; Europe

This chapter examines bioregional food systems and territorialization processes in peri-urban agricultural areas, using three case studies from Central America and Europe. It notes that the historical co-evolutionary relationship between cities and surrounding farmlands weakened in modernity due to the global capitalist market, which reduced food to a commodity. The study highlights current problems while exploring how inherited relationships are being revived to adapt urban bioregions to climate emergency and resource scarcity.

Ion Martínez Lorea · Revista Española de Sociología · Spain (Pamplona)

This article uses Henri Lefebvre's concept of concrete utopia to analyze the practices of community urban gardens in Pamplona-Iruña, Spain. It interrogates their potential and limitations in responding to various situations of social vulnerability and rethinking the relationship between the rural and the urban.

Susana Alves, Bahar Bașer Kalyoncuoğlu · Ecopsychology · Turkey (Istanbul)

This study explored the socio-ecological potential of urban agriculture in 10 family-related projects in Istanbul, where Bostans (historical urban vegetable gardens) are culturally significant. Despite their importance and UNESCO recognition, the planning and management of bostans have been hampered by rapid urbanization and a lack of integrative policies. Data from interviews, observations, and fieldwork highlighted the role of kinship in knowledge transfer and how farmers base activities on past-present affordances and future expectations.

Petr Klusáček, Stanislav Martinát, Klára Charvátová, Josef Navrátil · Land · Europe

This study investigated the drivers of de-agrarianization in post-socialist cities, using Brno, Czech Republic, as a case study through qualitative interviews. It found procedural issues in preserving architectural heritage during the redevelopment of a former Cistercian monastery site, often resulting in only fragments being preserved. The research also demonstrated a decline in the use of urban agricultural properties, which are rapidly transformed into new urban environments under intense urbanization pressures.

Dominika Dymek, Agnieszka Wilkaniec, Leszek Bednorz, Magdalena Szczepańska · Sustainability · Poland

This study in Poznań, Poland, examined the significance of allotment gardens in the urban green space system and developed a classification method for urban planning. While over 30% of allotment gardens were found to be of high significance, urban planning documentation indicates plans to reduce their area. Even highly significant gardens are slated for liquidation, highlighting a conflict between their ecological value and current urban development plans.

Sabina Rossini Oliva, Rafael López Núñez · Agronomy · Spain

This study investigated potential toxic element contamination in food and soils from urban and rural gardens in Seville, Spain, including urban gardens in a mining area. Soils from mining gardens were the most contaminated. While arsenic, cadmium, and lead concentrations in studied vegetables did not exceed legal maximum levels, high levels of barium (up to 42 mg kg−1) and zinc (up to 123 mg kg−1) were found in leafy green vegetables like chard and lettuce, indicating a need for further study on associated human health risks.

Magdalena Szczepańska, Ewa Kacprzak, Barbara Maćkiewicz, Lidia Poniży · Moravian Geographical Reports · Germany; Poland

A comparative study analyzed the use and development of allotment gardens (AGs) in Westphalia and Lippe (Germany) and Wielkopolska (Poland). AGs in Westphalia and Lippe are accessible and harmoniously integrated into the landscape, while AGs in Wielkopolska are less accessible, prioritize internal users, and do not always blend with their surroundings. The considerable freedom enjoyed by Polish plot-holders leads to a gradual marginalization of edible-plant growing.

Viktoria Shchurova · Current problems of architecture and urban planning · Ukraine (Kiev)

This article highlights the problems of the negative impact of the agricultural sector integrated into the central and middle zones of large cities. A critical view was formulated on the practical implementation of scientific and legislative documents, using the example of the city of Kiev, and strategies for reorganization, restrictions, or a complete ban on estate development in urban environments were analyzed. Specific plots of estate development in Kiev were identified as requiring reconstruction or complete renovation in accordance with the city's strategic development concept.

Perla Zambrano-Prado, Francesco Orsini, Joan Rieradevall, Alejandro Josa, Xavier Gabarrell · Frontiers in Sustainable Food Systems · Europe

A study developing a framework and overview of key factors, policies, and barriers associated with rooftop urban agriculture (RUA) integration, based on stakeholder perspectives in four European cities—Barcelona, Berlin, Bologna, and Paris—via a two-phase workshop and stakeholder survey. While education, environmental, research, technological innovation, food production, and social factors were found to play an important role in implementing RUA, the cost of water and pollution emerged as major contextual factors constraining it. Policies related to food trade and urban planning were the most limiting to RUA development, and major architectural and technical barriers were identified around building height limits, historical buildings, lack of specific building codes, and roof accessibility, with high infrastructure costs and policies prohibiting RUA product sales acting as economic constraints. The cities differed significantly in the perceived effect of urban policy on RUA diffusion and the perceived relevance of economic and pollution factors, and the study concludes that wider dissemination of RUA information and new or revised regulations and building codes are needed.

Paola Branduini, Elena Colli · Landscape Research · Italy

A qualitative sociological analysis examined a policy tool used by public landowners in peri-urban Milan, Italy, who introduced new lease agreements transferring the maintenance costs of built rural heritage to tenants, aiming to avoid degradation and add value to unused buildings. Analyzing the tool through the lens of social justice and its impact on quality of life, the study found that the same policy tool produces very different outcomes for landscape preservation and quality of life depending on the implementation strategy used, and on the elements of social justice considered along with contextual and individual characteristics.

Panagiota Kotsila, Isabelle Anguelovski, Francesc Baró, Johannes Langemeyer, Filka Sekulova, James J. Connolly · Environment and Planning E Nature and Space · Spain (Barcelona)

This paper analyzes nature-based solutions (NBS) as discursive tools that create an inviting space for nature's neoliberalization processes, examining two city-initiated projects in Barcelona, Spain: the Passeig de Sant Joan green corridor and the Espai Germanetes community garden. The study found that urban nature can serve elite economic players at the expense of widespread socio-ecological benefits. It also noted that outcomes regarding neoliberalism and its contestation were very distinct between the two projects due to different forms of governance.

Ulrich Häpke · sub\urban zeitschrift für kritische stadtforschung · Germany (Ruhrgebiet)

While statistical data demonstrates the significance of urban agriculture in German cities and metropolitan areas, urban agriculture faces the problem of constant land loss despite its proximity to consumers. The example of the Ruhrgebiet highlights challenges such as land loss and high proportions of leased land, indicating governance issues faced by urban agriculture.