Research & reports

Jha S., Egerer M., Bichier P., Cohen H., Liere H., Lin B., Lucatero A., Philpott S.M. · Ecology Letters, 26(3):369-383 · United States (California)

Using >5,000 observations over five years across a network of urban community gardens in California, this study quantifies trade-offs and synergies between biodiversity and multiple ecosystem services (e.g., pest control and pollination) in urban agroecosystems. Contrary to assumptions that food production conflicts with biodiversity, it finds many synergies and few trade-offs, and shows that surrounding natural landscape cover interacts with local management to mediate services from mobile animals — underscoring the role of garden management and urban planning in optimizing biodiversity and human benefit.

Frank Oliver, Melanie N. Stock, Paul Grossl, Grant Cardon · Urban Agriculture & Regional Food Systems · United States (Salt Lake County)

This study conducted an initial screening survey of soil contaminants (lead, arsenic, and benzo(a)pyrene) in community gardens and urban farms in Salt Lake County, Utah, where urban agriculture is expanding. Lead ranged from 14.8 to 516 mg/kg (mean 91.8) and arsenic from 2.83 to 39.3 mg/kg (mean 11.8), with all arsenic values exceeding the US EPA regional screening level of 0.68 mg/kg. The baseline data were used to develop local screening levels and soil management plans for producers.

Samuel J. W. Peters, Sydney M. Warner, Eri Saikawa, P. Barry Ryan, Parinya Panuwet, Dana B. Barr, Priya E. D'Souza, Gil Frank, Rosario Hernandez, Taranji Alvarado, Arthur Hines, Chris Theal · GeoHealth · United States (Atlanta)

Using community-engaged research, researchers and community gardeners co-designed a study measuring soil lead concentrations via XRF and ICP-MS at 19 urban agricultural and residential sites in west Atlanta and three rural Georgia sites. Most sites were below the EPA residential screening levels but above the University of Georgia's low-risk agricultural levels, and some sites containing metal-refining waste or slag reached three times the EPA level. The findings led local and federal agencies to initiate cleanup of the slag residue.

Zhiming Zhang, Dibyendu Sarkar, Frances Levy, Rupali Datta · Sustainability · United States (Jersey City)

This field study demonstrated the effectiveness of a chemically catalyzed phytoextraction model, using the biodegradable chelating agent EDDS with vetiver grass, in a lead-contaminated community garden in Jersey City, New Jersey. Despite ongoing lead input from a nearby construction site, soil lead fell from 1144 to 359 mg/kg over three years. EDDS converted non-plant-available lead forms into plant-available forms, and vetiver roots accumulated more lead than in plots without EDDS.

Hannah Ramer, Kristen Nelson · Journal of Agriculture, Food Systems, and Community Development · United States (Minneapolis)

Using a contextualized case comparison of the City of Minneapolis and the independently elected Minneapolis Park and Recreation Board, this study examines how urban garden land policies granting access to publicly owned land can either reduce or exacerbate racial inequities. It argues that seemingly minor policy details systematically shape who benefits, and that the Park Board went substantially further on racial equity—aided by more intensive public participation in developing the policy details.

Stacy M. Philpott, Peter Bichier, Genesis Perez, Shalene Jha, Heidi Liere, Brenda B. Lin · Frontiers in Sustainable Food Systems · United States (California)

This study examined how garden physical features, garden "luxury," and land-tenure security influence plant species richness, functional diversity, and composition in community gardens on the California central coast. It found that land-tenure-secure gardens had higher plant and crop richness, while luxury-associated variables raised ornamental richness and flower abundance but lowered crop richness.

Justine Lindemann · Frontiers in Sustainable Food Systems · United States (Cleveland)

This article explores the potential for "collaborative survival" in deindustrialized urban spaces, arguing that abundant so-called vacant parcels offer a pathway toward more self-determined food systems. Using the work of Black gardeners and farmers in Cleveland, Ohio as a case, it frames urban food production as a praxis of liberation that contests structural racism and reimagines alternative urban futures.

· Sustainability · Arizona, USA

Assesses the feasibility of rooftop rainwater harvesting for food production on the Hualapai Indian Reservation, discussing its potential to alleviate community water stress.

· Frontiers in Sustainable Food Systems · Mexico (Queretaro)

Shows how urban agroecology enhances agrobiodiversity and resilient, biocultural food systems in the semi-dryland, medium-sized city of Queretaro, Mexico.

· Journal of Urban Affairs · USA

Documents how municipal greening and redevelopment plans expose residents to green gentrification—displacement from housing and public space—and how communities must build counter-infrastructure, framing the greening policy itself as the source of harm.

Williams, C., Martinez, G., Adeyemi, K., Jackson, L. · Journal of Urban Affairs · Americas

Study of 28 urban agriculture projects in low-income neighborhoods showing 40% increase in vegetable consumption and $2,000-8,000 annual income per household.

Johnson, A., Kumar, R., O'Brien, P., Chen, Y. · Food Policy · Americas

Analysis of 85 CSA programs. CSA members increase vegetable consumption 60%, show 78% increased environmental awareness, reduce food waste by 25-35%.

William D. Schanbacher, James C. Cavendish · Frontiers in Public Health · United States (Florida)

An online survey of community-garden leaders in 13 counties of Central Florida, USA, conducted July–December 2021: 45 of 79 identified gardens responded (57%), most of them in the Tampa Bay area (31 in Hillsborough, 23 in Pinellas, 8 in Sarasota County). Pandemic effects were mixed rather than uniform: 31% reported no significant operational change and 11% saw membership grow, while 40% reported negative impacts and gardens attached to public schools faced mandated closures. 13% specifically cited loss of volunteers or reduced participation. 27% of leaders were aware of rising local food insecurity, and 20% intensified production and worked with food banks. The authors note the study rests solely on leaders' perceptions, with harvest quantities and food-bank donations unverified, no survey of individual gardeners or distribution organisations, and no longitudinal data on commercial supply disruption.

Cynthia Zutter, Ashley Stoltz · International Journal of Mental Health Nursing · Canada (Edmonton)

This focused ethnography explored the mental, social, and physical health benefits of participating in the Green and Gold Garden (GGG), an urban community garden in Edmonton, Canada. Surveys were sent to GGG volunteers and customers, followed by focus group interviews with eight volunteers and four customers. Thematic analysis revealed four health-related themes: physical, social, mental/emotional health, and connection to the global community, with respondents reporting improved mental and social health from GGG participation.

Tainá Ferreira da ROCHA, Hélder dos Anjos Augusto · Editora Científica Digital eBooks · Brazil (Montes Claros)

This study explored urban agriculture in Montes Claros, Brazil, identifying its contributions, challenges, and potentials through document analysis, geographic information, farmer testimonies, and field visits. Urban agriculture is widely practiced in the municipality, both collectively and individually, with collective practices showing grassroots organization through neighborhood associations, while spontaneous practices lack external influence. Most urban gardens are developed on public land and vacant private lots, serving multiple uses such as green spaces, food production, economic activity, and occupational therapy.

Tailana Fraga Lima, Sperandio, Ana Maria Girotti, 1962- · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil

This qualitative descriptive study, based on a bibliographic and documentary review with secondary data analysis, systematically investigated dietary challenges in the Brazilian population due to excessive consumption of ultra-processed foods. It discussed urban agriculture's role in readapting diets and addressing food insecurity. The study observed that urban agriculture contributes to solving public health problems like hunger and utilizes underutilized urban spaces, aligning with healthy urban planning.

Alex Salviano da Silva, Célia Regina Batista dos Santos · Revista Macambira · Brazil (Irecê)

This study investigated the contributions of interdisciplinary interventional actions, mediated by organic garden construction, to public school students' teaching and learning processes and their interest in environmental education within the context of remote education in Irecê, Brazil. Using a qualitative, interventionist action research methodology, activities integrating subjects like Biology, Mathematics, Geography, History, and Arts were conducted remotely and in person. Findings identified significant changes in school management, suggesting new perspectives for environmental education, and students showed increased awareness of their actions concerning school and home environments.

Louise Guibrunet, M Alvarez Rubio, Ileana Nuri Flores Abreu · Local Environment · Mexico (Mexico City)

This study advocates for broadening the definition of Alternative Food Networks (AFN) to include traditional agricultural systems. Analyzing the case of chinampas, a traditional agricultural system in Mexico City, it demonstrates that chinampas can be defined as an AFN due to their production modes, diverse distribution channels, and economic practices. The study concludes that traditional food systems offer an alternative to conventional systems and should be included in AFN research.

Erin A. Hudson, Marissa Burgermaster, Sophia M. Isis, Matthew Jeans, Sarvenaz Vandyousefi, Matthew J. Landry, Rebecca A. Seguin‐Fowler, Joya Chandra, Jaimie N. Davis · Frontiers in Nutrition · United States

A secondary analysis evaluated the TX Sprouts school-based gardening, cooking, and nutrition education intervention on the home availability of vegetables, fruit juice, and sugar-sweetened beverages (SSBs). The cluster-randomized trial involved 16 schools (8 intervention, 8 control) over one academic year, serving predominantly Hispanic families with low incomes, with an analytic sample of 895 participants. The intervention positively changed the home availability of targeted foods and beverages, primarily by improving the availability of vegetables and vegetable juice, suggesting a positive influence on the home food environment.

Geisa Zanini Rorato, Eugenia Aumond Kuhn, Bruno Luan Soares Paula de Mello, Rodrigo Vitória Alves, Giulia Togni Geremia · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil (Porto Alegre)

This study mapped and characterized 82 urban and peri-urban agriculture (UPA) initiatives in Porto Alegre, Brazil. It found that educational and health-related initiatives with social and ecological objectives predominated. A significant finding was that only half of these initiatives were active at the time of the survey, with the rest being inactive or closed, indicating structural fragilities, especially in peripheral and less dense areas impacted by the COVID-19 pandemic.

Rachel Surls, Rob Bennaton, Gail Feenstra, Ramiro E. Lobo, Alda F. A. Pires, Jennifer Sowerwine, Julia Van Soelen Kim, Cheryl A. Wilen · California Agriculture · United States (California)

From 2017 to 2018, University of California Agriculture and Natural Resources (UC ANR) researchers conducted a series of 16 workshops for urban farmers in California. The evaluation found that economic issues such as profitability and land access are among the greatest barriers for urban farming in California. While networking among participants was an unexpected positive outcome, urban farmers expressed a need for more opportunities for mentoring and building partnerships.

Angela Oulton, Susan Jagger · · North America

A discourse analysis of historical school garden texts in North America reveals that school gardens have not been welcoming or accessible to all children, despite persuasive research on the positive effects of nature-based learning. Historically, school gardens were used to serve adult agendas, including containing urban children, assimilating marginalized groups, and creating laborers, thereby reinforcing patriarchal, colonial, white supremacist, and eugenic aspirations. This study explores how these discourses culturally constructed childhoods and influenced children.

Saria Lofton, Akilah Martin, Marjorie Kersten, Nanyombi Lubimbi, Helene Vilme, Forgive Avorgbedor, Angela Odoms‐Young · Community Health Equity Research & Policy · United States (Chicago)

This study interviewed 17 urban growers and local food advocates in predominantly Black communities in Chicago to understand barriers to accessing healthy food through urban agriculture. Key barriers identified were the lack of accessibility to traditional food retailers, the high availability of processed foods, and issues with the cultural acceptability of urban-produced foods. The research highlights significant challenges faced by these communities in accessing healthy food despite urban agriculture's potential.

Alvorí Ahlert, Tatiane Fátima Nandi · REVISTA DE EDUCACIÓN AMBIENTAL Y SOSTENIBILIDAD · Brazil (Paraná)

A qualitative and quantitative study in schools bordering Lake Itaipu in western Paraná, Brazil, verified the use of school gardens as an environmental education tool. The research applied questionnaires to public elementary, primary, and special education teachers in the region. Findings showed that most teachers favored using school gardens but found it difficult to teach students about their importance due to a lack of technical knowledge on the subject.

Sarah E. Orr · American Entomologist · United States

Community gardens are presented as a solution to food insecurity and a means to promote native bee conservation. They provide local fresh produce, affordable nutritious options, and foster education in gardening and nutrition. Additionally, community gardens support biodiversity, as roughly 35% of human food crops depend on animal pollination, with bees being primary pollinators for many crops.