Research & reports

Medina Veliu, Hugo López-Romano, Giuseppe Picca, Marco Panettieri, Eduardo Moreno‐Jiménez, Denis Courtier‐Murias, Liliane Jean‐Soro, Johnny Gaspéri, Laura L. de Sosa · Ecotoxicology and Environmental Safety · Spain (Madrid)

This study investigated the impact of biochar-amended composts on trace element and nutrient dynamics in rooftop farming systems by cultivating tomatoes, lettuce, and Swiss chard for three years on a Madrid rooftop. Six substrates derived from spent coffee grounds, coffee silverskin, and seaweeds, with and without biochar, were used. Results showed that biochar reduced plant uptake and leaching of trace elements, lowering arsenic uptake by up to 40% in seaweed-based composts. Biochar also improved nutrient retention, reducing phosphorus and nitrogen losses by 40% and 25% respectively.

Coosje Dijkstra, Jutka Halberstadt, Jaap Seidell, Arnoud Verhoefff · VU Research Portal · Netherlands (Amsterdam)

In a school garden in Amsterdam-Zuidoost, children were amazed when their teacher pulled a radish from the ground and ate it. Most children followed suit and discovered that their self-harvested salad was tasty without dressing.

Christoph Koch, Maria da Glória Arrais Peter · Environmental Challenges · Germany

This citizen science study analyzed inorganic pollutants in private garden soils in central Germany, including front and backyards. Elevated levels of lead and copper were found in one-third of the samples, and zinc in two-thirds. Chromium and nickel concentrations were also elevated in a quarter of the samples, with some readily available substances exceeding limit values.

Corina Başnou, Geovana Mercado, Åsa Ode Sang, Thomas B. Randrup, Verónica Fabio, Adrián Cabezas, Arnau Lluch, Marc Montlleó, Juan Miguel Kanai, Riccardo Saraco, Olívia Bina, Tom Wild · Nature-Based Solutions · Europe

An overview and guidance for air pollution indicators in nature-based solutions (NBS) for urban green planning and public health were provided, using three case studies in Europe and Latin America. The study noted that approaches including multidimensional indicators in research, planning, and policies are limited, and national standards for some air pollutants are missing with little evidence for health effect thresholds. Findings also indicated that knowledge of pollutant uptake in edible plants can suggest potential human exposure risks.

Grzegorz Budzik, Marta Sylla, Catharina J.E. Schulp · Journal of Environmental Management · Europe

The cooling potential of allotments across European Functional Urban Areas (FUAs) was assessed. Allotments provide cooling services to 4.1 million people within FUAs, including 1.7 million in Germany. Each square kilometer of allotments cools an average of 8,221 people, with the cooled area being, on average, 2.8 times larger than the allotment size. Urban agriculture was 23% more efficient than peri-urban agriculture, but only 5% of allotments cooled areas with the highest heat risk.

Laura Sheard, Giorgia Previdoli, Wendy Burton, Rachel Benchekroun, Maddy Power, Bob Doherty, Philip Hadley, Ariadne Beatrice Kapetanaki, Shahid Islam, Sairah Mirza, Claire Cameron, Kate E. Pickett, Angela Hutton, Charlotte Edwards, Maria Bryant · PLoS ONE · United Kingdom

This research protocol describes a mixed-methods study aiming to understand which approaches adopted by community food organizations are most likely to prevent the need for emergency food in two multicultural communities in Bradford and Tower Hamlets, England. The study will create a typology of community food organization approaches through surveys, system mapping workshops, and stakeholder interviews, and will conduct a 12-month ethnographic study in up to 10 organizations and longitudinal qualitative research with up to 35 families.

Juan Diego Torres, Sara R. Jaeger, Patricia Puerta, Amparo Tárrega · Applied Food Research · Spain

This study investigated Spanish consumers' perceptions of five lettuce cultivation systems using explicit and implicit methods with 105 participants. Local/small agriculture was most favorably regarded, while urban community gardens were perceived as less safe for lettuce production. High-tech greenhouses were considered safer but less sustainable, and vertical indoor farming elicited a surprise reaction due to low familiarity.

Dariusz Gruszka, Katarzyna Szopka, Cezary Kabała · Land · Poland (Wroclaw)

This study in Wroclaw, Poland, investigated the quality of constructed technogenic soils in urban gardens located on a reclaimed clay pit. Despite beneficial physicochemical properties and high fertility in the topsoil layers, the soils were seriously contaminated with trace elements, including zinc (up to 1700 mg kg−1), lead (920 mg kg−1), copper (740 mg kg−1), cadmium (5.1 mg kg−1), mercury (7.4 mg kg−1), and arsenic (5.1 mg kg−1). This contamination, likely from industrial and urban waste used for mine infilling, compromises soil quality and poses potential health and ecological risks.

Chris Blythe, Silvio Caputo, Michael Hardman, Paul Milbourne, Victoria Schoen · Kent Academic Repository (University of Kent) · United Kingdom

This chapter examines the impact of urban food growing on individual, household, and community resilience, well-being, environment, and local food systems in the UK during and beyond the COVID-19 pandemic, drawing on survey and research data. It discusses the potential role of urban food growing in post-pandemic food security, environment, health, and society, and considers how "crisis gardening" experiences are leading to calls for new approaches to urban food growing in the UK.

Mellany N.C. van Bommel, Marthe L. Derkzen, Lenneke Vaandrager · Wellbeing Space and Society · Europe

This mixed-methods study aimed to understand the meanings attributed to green citizen initiatives in the Netherlands by using the concept of sense of place and to investigate which factors predict this sense of place. Surveys (n=130) were used alongside interviews with 38 participants from ten green citizen initiatives. Findings demonstrate a strong sense of place among participants, which was significantly predicted by meaningful experiences, a sense of safety within the initiative, and length of involvement. Participation in green citizen initiatives appears to create meaning across place attachment, place identity, place dependence, and a broader societal meaning of place.

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.

Kadri Maikov · Vytautas Magnus University · Europe

The Nordplus project "Healing greenery" has fostered interdisciplinary collaboration since 2018, bringing together international students and lecturers to design healing green spaces. Educational projects serve as a research foundation to raise awareness of environmental risks and the importance of green spaces for mental health, addressing the new generation's disconnect from nature. Participants in annual projects (2021-2024, 19-26 participants each year) highlighted environmental risks including insufficient green spaces and limited awareness of nature’s impact on health.

Maciej Lasocki, Kinga Zinowiec-Cieplik, Piotr Majewski, Maja Radziemska, Renata Giedych, Damian Derewońko, Maria Kaczorowska, Anna Szczeblewska, Marta Melon, B J Gawryszewska · Sustainability · Poland (Warsaw)

This study examined family allotment gardens in Warsaw, Poland, as a means of enhancing urban living environments and promoting residents' well-being. The research employed a literature review, qualitative data analysis from individual in-depth and focus group interviews, and a matrix analysis. Findings identified well-being features associated with allotment gardens, including recreation, leisure, impact on physical and mental health, formation of social relationships, and self-production of healthy, affordable food. The results also emphasized the importance of accessibility and the acquisition of new competencies as primary contributions.

Renata Jóźwik · Arts · Poland

This article analyzes how biophilic architecture employs immersive strategies to transform buildings into environments that support sensory, behavioral, and social practices. It analyzes projects such as the Rooftop Garden—Warsaw University Library, Musée du quai Branly, and apartment buildings Bosco Verticale, and proposes a Multi-criteria Method for Assessing Architectural Immersiveness (MMAAI). Findings indicate that the integration of nature, technology, and spatial narrative enables architecture to act as a mediator between humans and the environment, generating new qualities of spatial experience in the Anthropocene epoch.

Simona Gavrilaş, Oana Brînzan, Radu Lucian Blaga, Maria Sinaci, Eugenia Țigan, Nicoleta Mateoc-Sîrb · Agriculture · Europe

This study investigated the correlations between perceived benefits of urban agriculture (socialization, recreation, and food waste avoidance) and education levels and financial situations among 648 inhabitants of western Romanian towns, using data collected via an online questionnaire. Analysis showed that a high level of education leads to increased belief in urban farming's contributions to improving residents' socialization and recreation. Income level also significantly shaped opinions regarding urban agriculture's contribution to increased recycling.

Sara Mahdizadeh, Yun Gao · Local Environment · United Kingdom

This qualitative study, based on 16 semi-structured interviews, examined motivations and barriers to participation in community gardens in Huddersfield, UK. Key motivations included social interaction, mental well-being, and skill development. Reported barriers were declining volunteer numbers, physical workload, limited institutional support, and accessibility challenges.

Anna Birgitte Milford, Daniel Keech, Sarah Wangui Muiruri · Agricultural and Food Economics · Europe

This survey study explored differences in organizational models and member characteristics of Community Supported Agriculture (CSA) in Norway and the UK, focusing on factors contributing to member contentment, mental health, and vegetable consumption. Norwegian CSA members participated more actively in cultivation and harvesting and more often prepaid subscriptions than British members. In both countries, CSA membership was perceived to improve members' quality of life, vegetable intake, and physical and mental health, with more active members reporting higher satisfaction and stronger positive effects on vegetable consumption and mental health.

Barelds-Cramer, Leonie, Kapteijns, Annemarie, Battjes-Fries, Marieke · Zenodo (CERN European Organization for Nuclear Research) · Europe

This report presents the outcomes and insights from a series of co-design workshops conducted at four FEAST Living Labs — Leuven (Belgium), Oxfordshire (UK), Ghent (Belgium), and Tuscany (Italy) — aimed at developing community-driven solutions supporting healthier, more sustainable food choices. The workshops used a participatory design methodology including timeline reflection, cognitive mapping of bottlenecks and qualities, and solution-pathway development. In Leuven, mothers of primary-school children wanted enjoyable, healthy, sustainable food to become a social norm, especially in schools, citing increasing exposure to unhealthy food marketing, affordability, and limited healthy school offerings; bottlenecks were mainly at the meso level, and proposed solutions included nutrition education as a standard school subject, stronger regulation of unhealthy food marketing, and digital tools to build knowledge. In Oxfordshire, parents of young children prioritized access to affordable fresh produce, opportunities for community growing, time to cook from scratch, and reduced waste; bottlenecks were more often at the micro level — limited skills, fussy eating, convenience pressures, and high food prices — with solutions including a free recipe and advice app, community gardens, cooking classes, better promotion of local support services, and initiatives connecting farmers and residents. In Ghent, professional stakeholders from food-related organizations in disadvantaged neighborhoods shared a goal of fair food access and stronger community connection through food, identifying bottlenecks in fragmented service provision, pricing barriers, and limited visibility of available food support.

Jacek Antonkiewicz, Iwona Paśmionka, Grzegorz Szychowski · Soil Science Annual · Poland

Following a flood that inundated allotment gardens in Nysa, southern Poland, for up to 14 days after the water rose on 14 September 2024, researchers analyzed 12 soil samples collected in early spring 2025 from two allotment garden sites. Most soils were found limed and disinfected, with high organic matter but low total potassium, sodium and sulfur. Zinc and copper concentrations exceeded the average for Polish arable soils, pointing to use of materials enriched with these elements.

Jarosław Chmielewski, Barbara Gworek, Alicja Walosik, Magdalena Florek-Łuszczki · Annals of Agricultural and Environmental Medicine · Poland

Soil (N=196) and root vegetable (N=94) samples from 16 allotment gardens in Warsaw, Poland, were analyzed for manganese, zinc, copper, lead and cadmium and assessed for health risk. Parsley, carrots, beetroots and celery grown in these gardens accumulated elevated levels of all five metals, and the health risk assessment found an increased risk of carcinogenic effects from cadmium and lead in consumers of these root vegetables; the authors conclude consumption of vegetables from the examined gardens should be very limited or eliminated from the diet entirely.

Anna Stage (17743305), Marie Caroline Vermund (11075551), Mads Bølling (6661577), Camilla Roed Otte (21175813), Alberte Laura Oest Müllertz (21175816), Peter Bentsen (3527732), Glen Nielsen (10468844), Peter Elsborg (8894495) · Figshare · Europe

This is the SPIRIT checklist for the FoodACT protocol, a multimethod, quasi-experimental study preregistered with ClinicalTrials.gov (#NCT05839080) investigating how the existing Danish school garden program Gardens to Bellies (GtB), delivered at six locations across Region Zealand and Region of Southern Denmark, affects fourth-grade pupils' food literacy, climate change literacy, school motivation and physical activity. Approximately 1,600 pupils attending GtB form the intervention group and approximately 1,600 pupils from non-participating schools form the control group, with pupils in the eight-session program growing, preparing and cooking foods; outcomes will be measured via pre/post surveys, accelerometry in a 900-pupil subsample, text-message surveys and semi-structured and focus-group interviews, analyzed using linear mixed models and thematic analysis. As a protocol document, it describes study design rather than results.

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.

· Land · Germany

Presents a national ecosystem-service indicator for Germany to assess and monitor local climate regulation provided by urban green infrastructure.

Pancras T., van Bentum E., de Pagter L., van Hoef M., Hoogenboom R., Berendsen B., van Leeuwen S. · Chemosphere · Netherlands

Fruits and vegetables from allotments contaminated by atmospheric deposition from a fluorochemical plant contained PFASs such as PFOA and GenX, with the highest levels downwind and in brassicas, leafy and root vegetables.

Adrian J Hayes, Tulane Chiarletti, Stephanie Hares, Sarah Devereux, Stephanie Upton, Daniel McNamara, Sally Brookes · Therapeutic Communities The International Journal of Therapeutic Communities · United Kingdom (South West of England)

This paper reports on the development and running of Foundations Group, a pilot 2-hour nano-therapeutic community (TC) intervention. Conducted within the NHS on City Farm premises in the South West of England for 18 months (2021–2022), the group comprised 11 members, one peer, and three staff. The authors reflected on the TC approach of democratic work, non-expert stance, and using support and challenge to enhance self-agency and belongingness, detailing the group's structure.