Research & reports

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.

Chmielewski J., Wszelaczyńska E., Pobereżny J., Florek-Łuszczki M., Gworek B. · Sustainability · Poland

The study sampled 112 items — 72 vegetable and 40 fruit — from 16 allotment gardens in Warsaw and measured Fe, Mn, Zn, Cu, Pb and Cd. Vegetables accumulated markedly more heavy metals than fruits, and leafy vegetables grown near high-traffic roads carried the highest Pb, Cd and Zn. Lead exceeded permissible limits by six to twelve times and cadmium by one to thirteen, leading the authors to advise against growing tomatoes in urban settings. Only trace amounts appeared in fruits, and the Hazard Index rated the fruits alone as safe. The paper calls for continuous monitoring of urban garden soils, remediation of contaminated ground and safer growing practices.

Ricard Segura, Johannes Langemeyer, Alba Badía, Sergi Ventura, Jaime Vila-Traver, Gara Villalba · The Science of The Total Environment · Spain (Barcelona)

A study in the Metropolitan Area of Barcelona, Spain, investigated the impacts of peri-urban agricultural expansion on the food-water-climate nexus using urban metabolism and atmospheric-biosphere models across four land-use scenarios. While expansion increased food production and irrigation water requirements, replacing natural non-forested and forest areas for peri-urban agriculture was predicted to reduce net ecosystem productivity by up to 18.5% and total carbon stocks by 3.3%. Irrigated peri-urban agriculture potentially reduced near-surface temperatures by 0.7°C, though reductions in the densest urban areas were minimal.

Neşe Börü · International Journal of Leadership in Education · Turkey

This case study investigated school principals' practices and barriers to sustainable development in Turkish K-12 schools under centralized management, using semi-structured interviews. The findings highlighted the need for leadership skills, collaboration with external bodies, public education, reward systems, and school budgets under a centralized management approach. The research identified that the centralized management system itself presents a barrier to sustainable development efforts in these schools.

Barbara Maćkiewicz, Paulina Jeziorek · Przegląd Geograficzny · Poland

A two-case study in Warsaw and Poznań, Poland, explored the relationship between community gardens and cultural institutions, identifying factors that promote and impede their functioning. The study found that these gardens are characterized by a changing governance model, shifting towards a top-down approach where community members lack influence on strategic decisions. The involvement of cultural institutions, while facilitating longevity, may simultaneously disempower the gardens' viability.

Melissa Anna Murphy, Pavel Grabalov · ˜The œGeojournal library · Europe

A study of urban agriculture initiatives in Aarhus, Denmark, and Rotterdam, the Netherlands, explored how municipalities facilitate urban agriculture and its performance in public spaces. It identified four public service trajectories: increasing access and animation, contributing to social services, producing and distributing food, and building communities. The study found that food production and social services may be little suited for urban spaces requiring high public access, although benefits can reach a broad public if localized and facilitated appropriately.

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.

Diana Krabbendam, Emiel Wolf, Bernie Deekens, Rosalie Bak, Hans Krikke · SpringerBriefs in applied sciences and technology · Netherlands (Amsterdam)

This chapter outlined activities for citizen-led projects in the Wildeman neighborhood in Amsterdam. The main challenges identified were a lack of trust and community feeling among inhabitants, a lack of involvement and ownership in neighborhood developments, and fragmented existing community activities and services.

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.

Holger Braun, Dorothee Apfel, Benedikt Rilling, Carsten Herbes · Cleaner and Responsible Consumption · Germany

A study with 44 hobby gardeners in Germany found that substrates are not a major part of gardeners' social interactions, and price is the dominant purchase criterion for substrates, with sustainability not playing an important role. Although basic knowledge about peat is widespread, purchasing substrates is a utility-driven process with mostly passive information behavior.

Amélie André · · United Kingdom

This case study of Letchworth Garden City examined the interplay between the town's layout, social practices, and governance supporting a local sustainable food economy. Food mapping and an ethnographical approach showed how Letchworth's masterplan provides a backbone for alternative food infrastructure, though the edible landscape is not always visible or effective for residents. Discussions with experts also pointed to a gap in coordination among key local stakeholders, which would be beneficial for improving the local urban food strategy.

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.

Ophélie Véron · Antipode · Germany (Berlin)

This paper, based on activist ethnography in Berlin's community gardens, people's kitchens, and co-operative projects, explores how community food spaces reproduce, exacerbate, or dismantle power relations and socio-environmental injustices. It systematically examines exclusion and inclusion dynamics, arguing that diversity alone is not a sufficient indicator of social equity and can overshadow forms of injustice. The study exposes the complex, dual nature of Berlin's food activist landscape, where privilege and power contribute to social inequities.

Anna Rosman, Joseph MacPherson, Marie Arndt, Katharina Helming · Agricultural Systems · Germany

This study investigated the impact of Community Supported Agriculture (CSA) structures on farm resilience among CSA farmers in Germany. A mixed methodology was applied, combining a case study with one CSA farmer and a survey of CSA farmers across Germany. The findings indicated that CSA provides mechanisms for improving farm resilience through increased income security, risk protection, market independence, and satisfaction. CSA farmers demonstrated a high level of perceived resilience compared to non-CSA farmers.

Jaume Vilasís Pamos, Pablo Aránguiz, Stefhania Lozano, Guillermo Palau Salvador · Revista Lecciones Vitales · Spain (Valencia)

This study examines urban agriculture initiatives in Valencia, Spain, which adopt an agroecological approach to promote sustainable practices like composting. While these collective strategies aim for sustainable agricultural models and contribute to food sovereignty, they face significant challenges, particularly regarding access to water. The initiatives also engage in political action and promote equitable organizational models.

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.

Sabina Rossini Oliva, Rafael López Núñez · Environmental Science and Pollution Research · Spain (Andalusia)

This study evaluated potentially toxic elements (PTEs) in vegetables and topsoils from urban gardens in Seville, Cordoba, Huelva, and a mining area (Riotinto), Spain, comparing them with market and peri-urban samples. Soils in the mining area and cities generally showed higher contamination with As, Cr, Cu, Pb, and Zn compared to other locations. Despite this, all PTE concentrations in vegetables from the studied urban gardens, including those from As-contaminated soils, were below health-based guidance values and market levels (except lettuce), and human health risk assessments indicated safe consumption.

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.

Elliot Buckminster, Charlotte Breckenridge, Thomas Sedgwick · International Journal of Research in Agronomy · United Kingdom

This research quantified soil-to-plant transfer factors for six heavy metals (Cd, Pb, Zn, Cu, Ni, Cr) in lettuce, spinach, and carrot across 20 peri-urban agricultural sites in Berkshire, UK, from 2021-2022. Cadmium exhibited the highest mean transfer factor (0.31), and at 4 of 20 sites, cadmium concentrations in lettuce exceeded the EU maximum limit of 0.20 mg/kg fresh weight. Soil pH was a strong predictor for Cd and Zn transfer factors, with TFs increasing below pH 6.0.

Faiza Darkhani · Frontiers in Sustainable Food Systems · Germany (Berlin)

A qualitative content analysis of interviews with active female respondents in community-supported agriculture, food cooperatives, and self-harvest gardens in Berlin Brandenburg revealed challenges faced by women in alternative food networks. Interviewees expressed optimism but emphasized the need for increased governmental support and community engagement, and the data highlighted demands for gender equality improvements and support mechanisms.

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.

Silvia Gullino, Heidi Seetzen · · United Kingdom (London)

This ethnographic research in a former Victorian square in South London examined how residents transformed derelict spaces, including creating two community gardens, over three decades. The study found that while informal, bottom-up practices shaped a vibrant urban culture, the neighborhood is now undergoing progressive gentrification. This gentrification reflects trends in other London neighborhoods, posing challenges to community initiatives.

Cosimo Dondini, Xavier Úbeda, Giacomo Certini, Marcos Francos · Journal of Soils and Sediments · Spain (Barcelona)

This study analyzed soils from ten urban gardens in Barcelona, Spain, with a special focus on possible contaminants. Irrigation water was also analyzed, and some of the waters contained a high concentration of salts and nitrites, which are listed as a pollutant. While three tests for heavy metals did not attest to significant pollution, other toxic elements not considered in this study could come from road transport gases or the port of Barcelona. Overall, the soil quality was concluded to be suitable for growing vegetables.

Lucas López Sosa, Gloria E. Casanova Molina · Revista Temas Sociológicos · Spain (Barcelona), Chile

This ethnographic study conducted in Barcelona and Santiago de Chile comparatively analyzed the social utilities, conflicts, and tensions faced in the daily management of urban community gardens. The study found significant symbolic and practical similarities between the gardens in both cities, despite geographical and cultural differences, highlighting their value as tools for urban and social regeneration.

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.