Research & reports

Cleusa Fernandes Ramos, Andréia Assunção Soares, Isabela Carvalho dos Santos, F. Ramos, Odair Alberton, Luciana Kazue Otutumi, Lidiane Nunes Barbosa, Ricardo de Melo Germano, Daniela Dib Gonçalves, Luiz Sérgio Merlini · Journal of Pure and Applied Microbiology · Brazil

This 2020 study in Brazil evaluated the bacteriological quality of six medicinal plants from community gardens, including Cymbopogon citratus and Aloysia citriodora. Analysis of cold extracts revealed bacterial contamination, with Plectranthus barbalus showing the highest aerobic mesophile count and Aloysia citriodora the highest coliform count at 45°C. However, the study concluded that heat treatment (boiling for teas) can significantly reduce or eliminate this bacteriological contamination, making the plants safe for consumption.

Mawuna Donald Houessou, Mirte van de Louw, B.G.J.S. Sonneveld · Sustainability · Benin

To identify the main constraints to the expansion of urban agriculture (UA) in Benin, a systematic literature review, a survey among experienced urban gardeners, and in-depth interviews with stakeholders were conducted. The synthesis revealed five predominant constraints: lack of land and tenure insecurity, insufficient government support, restricted market access, limited access to productive factors, and inequality issues. Specifically, the survey indicated a political unwillingness, which was explained by the unperceived benefits of investing in UA and the lack of enforcement of urban development plans.

Jacob Wood, Caroline Wong, Swathi Paturi · eTropic electronic journal of studies in the tropics · Singapore

This research examines urban farming, specifically vertical farming methods, in Singapore. Despite substantial public and private investment in R&D for high-tech, high-yielding vertical farms, Singapore faces a highly constrained urban environment where land scarcity is exacerbated by a complex regulatory land use framework.

Ali Keyvanfar, Arezou Shafaghat, Tan Sze Inn, Sapura Mohamad · DigitalCommons - Kennesaw State University (Kennesaw State University) · Malaysia

This research developed the Sustainable Urban Farming Index Assessment (SUFIA) Model to quantify and evaluate the performance of urban farms' sustainable food production. Applying a critical literature review and Analytical Hierarchy Process (AHP), the model identified reducing air pollution, soil health and water cleaning, and food sovereignty as critical for food productivity. When implemented at Zenxin Organic Farm in Malaysia for validation, the farm earned a Grade C, indicating it is a usable urban farm but requires substantial improvements in areas such as soil health, water cleaning, site design, and community environment.

Maëlle Tripon, Dorothée Boccanfuso, Marie-Ève Yergeau · Cahiers de recherche · Global

This literature review examines urban agriculture (UA) models, their implementation contexts, production needs, and impacts. It highlights that UA faces limitations, particularly restricted access to good quality (unpolluted) soil, water, and air, which can negatively impact productivity. UA can also have negative impacts on ecosystems and human health, such as pollution and diseases, depending on management methods.

Erin Ingram, Jenny Keshwani · Journal of Extension · United States (Nebraska)

A survey of Nebraska schools characterized existing school-based growing spaces and identified challenges limiting garden-based STEM learning. The study confirmed the use of these spaces for K-12 STEM instruction, particularly in sciences. However, opportunities for technology and engineering experiences were found to be limited, indicating a need for additional professional development support to expand garden-based STEM learning.

Idris Mohammed, Abdella Kosa, Nuredin Juhar · Agricultural and Food Economics · Ethiopia

This study assessed the economic linkage between urban development and the livelihood of peri-urban farming communities in Ethiopia, focusing on current practices and policies. Data was collected from 30 municipal officials and 200 evicted peri-urban farmers across five municipalities in the Amara regional state. Findings indicate that the continuous eviction of peri-urban farmers from their indigenous land for redevelopment negatively affects their livelihood, highlighting significant equity issues. Factors contributing to urban expansion include economic policy reform, private investor incentives, and public sector projects, further exacerbated by policy limitations and lack of municipal intervention.

Wellbrock Wanja, Daniela Ludin, Ludwig Lisa N, Kristina Muhlfeld, Wolfgang Gerstlberger · Journal of Applied and Physical Sciences · Global

This paper examines whether Community Supported Agriculture (CSA) is a solution to the dilemma of farmers needing to operate both economically and sustainably. Through an expert interview and a survey of members, the study identifies problems in the realization of a CSA and provides possible solutions.

Paola Clerino, Agnès Fargue‐Lelièvre · Sustainability · France

This study used a participatory approach with French urban agriculture stakeholders to identify sustainability objectives and 21 criteria for professional intra-urban farms. Six objectives were established, and agro-environmental and socio-territorial criteria were deemed more important than economic ones, with food production not being mentioned. A critical finding was that decision-makers focused more on projects' external sustainability and urban farmers' agricultural background, suggesting a reliance on farmers for internal sustainability rather than direct assessment.

Thomas Gilardi · Geography Notebooks · Argentina

In the Bonearense region, urban expansion is encroaching on fertile plains, impacting territorial characteristics. While urban and peri-urban agriculture contributes to food sustenance for the AMBA population, it has not been sufficiently recognized for green area recovery, organic waste recycling, and wastewater management. Regional authorities have begun to acknowledge urban agriculture's role in combating urban poverty, but local economic development faces challenges in mediating food security and recreational services amidst pressures from urban real estate and agro-industrial production.

John Taylor · Frontiers in Sustainable Food Systems · United States (Rhode Island)

This long-term replicated trial in Rhode Island evaluated the yield performance and soil quality impacts of four small-scale food production systems over three summer growing seasons. While total marketable food yields (2.22 to 2.96 kg m-2) were modest compared to biointensive agriculture (4.64 kg m-2), individual crop yields often exceeded regional and national averages without soil quality loss. The study addresses a lack of experimental research on urban agriculture and provides a framework for normative research, offering more reliable yield estimates for modeling urban production potential.

Jennifer Jettner, Mary Secret · International Journal of Social Welfare · United States

This study examined the relationship between race and racial diversity on social capital in community gardens located in food deserts in the southeastern USA. Cross-level regression models were performed on a sample of 52 gardeners from 10 community gardens, analyzing their “sense of community” and the “number of resources” obtainable from fellow gardeners. Results indicated that community gardens are excellent vehicles for promoting one’s sense of community regardless of race or garden’s racial composition, but they were less likely to increase the number of resources. Accessing a greater number of resources took longer and more effort, and increased perceptions of racial diversity had a negative relationship with the number of resources.

Rebecca Leigh Rutt · Journal of Political Ecology · Denmark (Copenhagen)

Ethnographic research on a small rooftop garden in Copenhagen, Denmark, explored how urban farming initiatives interact with neoliberal trends. The study found that communal, eco-social urban farming endeavors are entangled in the city's neoliberal turn, with formalization processes and austerity measures both nurturing and endangering these initiatives. Neoliberal labor, food systems, and housing policies are shown to subvert convivial urban farming efforts.

Mosen Farhangi, Margherita Turvani, Arnold van der Valk, G.J. Carsjens · Sustainability · Netherlands (Amsterdam)

An ethnographic study in Amsterdam, Netherlands, analyzed barriers to the integration of high-tech urban agriculture (HTUA) into urban planning processes. The research revealed a lacking connection between planning actors and HTUA technology developers.

Lauren Chenarides, Carola Grebitus, Jayson L. Lusk, Iryna Printezis · Agribusiness · United States

This study examined household-level participation in urban agriculture (community and home growing) before (2017) and during (2020 lockdown) the COVID-19 pandemic in Phoenix, AZ, and Detroit, MI, using two online surveys and bivariate probit models. It found that considerably fewer individuals participated in community gardens compared to home gardening, and overall participation was lower in 2020 than in 2017. The continuity of individuals' participation in growing food at community gardens and home is fragile, and many urban households' food-growing practices may not yet be mainstream, suggesting other barriers inhibit participation.

Brittany Kesselman, Mvuselelo Ngcoya, Daniela Casale · Agroecology and Sustainable Food Systems · South Africa

This paper, based on research from two urban gardens in Johannesburg, South Africa, argues that contemporary urban dietary norms pose a challenge to urban agroecology. The dietary norms and practices of Johannesburg residents are poorly aligned with the production requirements and outputs of urban agroecology. Lessons from other countries suggest that the benefits of agroecology could be enhanced by targeting changes in food preparation and consumption practices.

Lauren Balotin, Samantha Distler, Antoinette L. Williams, Samuel J. W. Peters, Candis M. Hunter, Chris Theal, Gil Frank, Taranji Alvarado, Rosario Hernandez, Arthur Hines, Eri Saikawa · International Journal of Environmental Research and Public Health · United States (Atlanta)

This study investigated Atlanta residents' knowledge regarding heavy metal and metalloid (HMM) exposures and remediation in urban agriculture, following the detection of industrial slag and hazardous soil contamination in West Atlanta in 2018. Through surveys and follow-up interviews, it was found that participants were concerned about the potential health effects of soil contaminants but unconcerned with produce in their gardens. Gardeners' knowledge of HMM exposure sources and remediation methods was low and varied based on racial group.

Michelle Glowa, Antonio Roman-Alcalá · New York University Press eBooks · United States (California)

This chapter examines the San Francisco Urban Agriculture Alliance, analyzing its composition, genesis, and how it has confronted the tensions and limitations of neoliberal urbanization. Based on personal experiences and research, it proposes that justice-driven urban agriculture movements are influenced by political-economic changes and can be absorbed into existing neoliberal and pro-development trajectories. This indicates a critical finding regarding equity and the challenges urban agriculture faces in resisting gentrification.

A.T. Paraskevopoulou, Panagiotis Tsarouchas, Paraskevi A. Londra, A. Kamoutsis · Water · Global

This study investigated the effect of irrigation amount on the growth of four lavender species (Lavandula angustifolia, Lavandula dentata var. candicans, Lavandula dentata var. dentata, and Lavandula stoechas) in an extensive green roof system. Two irrigation treatments (high and low), determined by substrate hydraulic properties, were applied, and plant growth was measured. The results consistently showed that low irrigation reduced plant growth. However, with the exception of L. stoechas, the appearance of plants under low irrigation was satisfactory, supporting their use with reduced water.

Sara Giovansana, Giacomo Zanolin · Geography Notebooks · Germany (Berlin)

This study examines urban creativity in Berlin, focusing on urban gardens at Tempelhofer Feld and Prinzessinnengärten. Based on field research, it reflects on the potential of creative class initiatives in relation to gentrification. The work aims to outline the Berlin green experience as a sign of urban change.

Christine Lux, Brianna Routh, Lacy Stephens · Journal of Human Sciences and Extension · United States

This exploratory study surveyed 21 parents from a campus-based preschool in the northwest United States during the 2017-2018 school year to understand the impact of the "Harvest of the Month" program on children's nutrition behavior at home. Findings indicated that a variety of program foods were served and consumed at home, but parents prioritized knowing food origins over serving local foods. Parents' knowledge of farm to ECE, reported farmer's market purchases, and CSA participation were limited, suggesting a need for targeted parent education.

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.

Omanjana Goswami, Ashaki A. Rouff · Soil Systems · United States (Newark)

Soils from seven community farms in Newark, New Jersey, USA, were analyzed for lead (Pb) concentration and speciation. Single-step extractable Pb concentration ranged from 22 to 830 mg kg−1, with 21% of samples exceeding the NJDEP limit of 400 mg kg−1 for residential soils. Lowest Pb concentrations were detected in raised beds, while uncultivated native soil and parking lot samples had the highest values. Although most Pb is associated with reducible and oxidizable soil fractions, indicating a lower risk of mobility and bioavailability, Pb exposure through ingestion and inhalation pathways remains a concern when directly handling the soil.

Miho Lowan‐Trudeau, Noel Keough, Joshua Wong, Sara Haidey · Canadian Geographies / Géographies canadiennes · Canada (Calgary)

This study, examining community gardens in Calgary, aimed to determine the socio-economic demographics of neighborhoods supporting community gardens and their proximity to active transportation and public transit. GIS visualization and quantitative analyses were used to investigate relationships between demographic variables and transportation accessibility. Findings showed that community garden neighborhoods are located in areas with significantly fewer visible minorities, higher levels of educational attainment, and more attached dwellings like apartments and townhomes. This study suggests potential inequities in the proliferation of public community gardens based on socio-economic factors beyond economic capital.

Kit Prendergast · Pacific Conservation Biology · Australia

The African carder bee, Pseudoanthidium (Immanthidium) repetitum, first recorded in Queensland in 2000, has now been found in Western Australia, marking a significant distribution expansion. Three confirmed and one unconfirmed localities were identified in the Mandurah region, with abundant female specimens observed in one garden. The presence of this introduced species necessitates vigilance due to known negative impacts on native fauna and flora.