Research & reports

L. Garcia Ferreira, M. E. F. CORREIA, M. C. UZEDA · LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) · Brazil (Rio de Janeiro)

This study evaluated the role of agroecological urban and peri-urban agriculture in preserving native bee communities in the western region of Rio de Janeiro, Brazil. Ten different bee species, nesting in soil and cavities, were identified. Generalized Linear Models (GLMs) indicated that the percentage of agricultural, natural, and built-up land cover was insufficient to explain the species composition regarding their nesting habits. The findings suggest the importance of assessing the quality of agricultural environments, as their association with urban landscapes could support a greater richness of species with diverse nesting habits.

Joshua Garcia, Mariel Mondragon-Becerra, I. Rojas Martínez, Mallika Nocco, Cristina Lazcano · Applied Soil Ecology · United States (California)

A greenhouse trial was conducted in urban agricultural soil from the San Francisco Bay Area, USA, to investigate the effects of organic amendments derived from local municipal waste products on the soil microbiome, tomato productivity, and quality. Liquid food waste hydrolysate and mixed herbivore waste compost increased microbial abundance in the soil compared to mineral fertilizer. While mineral-fertilized tomato plants generally had higher productivity and yields, plants treated with the hydrolysate and mixed herbivore waste compost showed enhanced fruit soluble sugar content (°Brix).

Alexandra Zink, Paul J. CaraDonna, Kelly Larsen, Amy M. Iler · Ecosphere · United States (Chicago)

This study investigated how urbanization relates to pollination by growing 240 plants (squash and tomato) across six sites with varying urbanization levels in Chicago, Illinois. For tomatoes, the magnitude of pollen limitation increased with greater impervious surface, indicating more pronounced pollination deficits at highly urbanized sites. For squash, evidence of pollen limitation was found only at the most urban site, with a weak trend of pollen limitation of fruit set (but not seed set) increasing with impervious surface.

Brent F. Kim, Sara N. Lupolt, Raychel Santo, Grace H. Bachman, Xudong Zhu, Tianbao Yang, Naomi K. Fukagawa, Matthew L. Richardson, Carrie Green, Katherine M. Phillips, Keeve E. Nachman · PLoS ONE · United States

A pilot study (2024, PLoS ONE) planted Darkibor kale seedlings at three urban and four rural farms in and around Baltimore City, Maryland, had farmers grow them using their usual practices, and analyzed harvested kale for carotenoids, vitamins C and K1, ten nutritional elements, and eight non-essential metals. Sample sizes were in some cases too small to yield statistical significance, but the study identified potentially meaningful differences between urban and rural kale: mean carotenoid and vitamin concentrations were 22-38% higher in rural samples, while mean concentrations of eight nutritional elements were higher in urban samples, by as much as 413% for iron. Most of nine non-essential metals were higher on average in urban samples, though lead and cadmium concentrations across all samples stayed below public health guidelines; for six elements, variance within urban or within rural farms exceeded variance between the two groups, suggesting urbanicity may not be the primary driver of some differences, and some urban-rural gaps were more pronounced than in prior research.

Karen R. Klinger, Aster F. Hasle, Karen S. Oberhauser · Frontiers in Ecology and Evolution · United States (New York City)

Working with community scientists in the Chicago metropolitan area, researchers monitored monarch butterfly (Danaus plexippus) eggs and caterpillars on milkweed patches in yards and community gardens. Peak egg counts per patch ranged from zero to 170 across observation years; patch age and the presence of common milkweed (Asclepias syriaca) affected whether eggs were present, and patches with the highest egg counts tended to have A. syriaca, more milkweed plants, and greater diversity of blooming nectar plants.

AIPH (International Association of Horticultural Producers) · AIPH (International Association of Horticultural Producers) · Brazil

AIPH's Green City case study on Curitiba, Brazil (associated with the 2024 AIPH World Green City Awards), describes an urban agriculture program dating to the mid-1990s comprising 147 gardens — 47 community, 43 school, and 36 institutional — covering 17 hectares (177,000 m²). The gardens produce about 160 tons of vegetables per month and benefit 37,000 people; 89 beehives are also installed.

García-Vásquez R., Vera-Guzmán A.M., Carrillo-Rodríguez J.C., Pérez-Ochoa M.L., Aquino-Bolaños E.N., Alba-Jiménez J.E., Chávez-Servia J.L. · AIMS Agriculture and Food 8(3):832-850 · Mexico

Compared phenolics, vitamin C, carotenoids, capsaicinoids, and antioxidant activity in Oaxacan Huacle and De Agua pepper landraces versus commercial Jalapeño. Landraces showed higher flavonoid and carotenoid contents, underscoring indigenous germplasm value.

Riehn J.K., Fogel N.S., Hathaway J.N., Camilo G.R. · Frontiers in Sustainable Cities, 5:1100470 · United States (St. Louis, MO)

Surveyed bees on three urban rooftop food farms and two nearby ground-level community gardens in St. Louis during 2017–2018. Rooftops hosted 38 species—a nested subset of ground-level communities, with fewer bumblebees and more non-native Megachile—with implications for pollination services on rooftop food production.

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.

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.

· 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.

Gail MacInnis, Etienne Normandin, Carly D. Ziter · PeerJ · Canada (Montreal)

A study of wild bee communities across Montreal, Canada, greenspaces with differing honey bee densities, surveyed in 2020 and compared with 2013 baseline data. Sites with more honey bees had fewer wild bee species, and the negative association was strongest for small-bodied bees (inter-tegular span under 2.25 mm), whose shorter foraging ranges limit their access to floral resources under competition. Urban beekeeping is commonly promoted as environmentally beneficial, but this observational evidence indicates that high-density operations may pressure native pollinators through resource competition and pathogen transmission; the design is correlational rather than an experimental test of causation.

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.

Raphaela Dias da Rocha Silva, Amanda dos Santos Paulino, Marilua de Carvalho Feitoza, Angélica Oliveira de Souza, Ana Paula Branco do Nascimento · Revista Latino-americana de Ambiente Construído & Sustentabilidade · Brazil (São Paulo)

This study analyzed the cultivation of non-conventional food plants (PANC) in the Colectivo Horta das Flores urban garden in São Paulo, Brazil, and their contributions to the Sustainable Development Goals (SDGs). Researchers monitored the development of 18 plant species across five beds for six months, finding that six non-spontaneous PANC species and nine spontaneous PANC species performed best. The cultivation of PANC in this urban garden supports SDG 2 (Zero Hunger), SDG 11 (Sustainable Cities), and SDG 15 (Life on Land).

Marina Carboni, Vitoria Maria Domingues Moço · Revista Fatecnológica da Fatec-Jahu · Brazil

This paper presents a project proposal for an urban agroforestry system combined with a community garden in Brazil. The project aims to revitalize a 2,500m² urban green area currently lacking leisure attractions and adequate tree cover. The plan includes planting 35 trees of 8 fruit species and 9 vegetable species, and fencing the area to prevent theft and vandalism. The project is expected to offer vegetables and fruits to the local population, promote environmental education, and enhance ecosystem services such as temperature reduction and increased rainwater infiltration.

Elda Míriam Aldasoro Maya, Ulises Rodríguez‐Robles, María Luisa Martínez Gutiérrez, Guelmy Anilú Chan Mutul, Teresita Avilez López, Helda Morales, Bruce G. Ferguson, Jorge Mérida‐Rivas · Frontiers in Sustainable Food Systems · Mexico (Tabasco)

Meliponiculture, or stingless bee breeding, in Mesoamerica serves as an effective tool for agroecological education, scaling, and pollinator conservation. In Tabasco, Mexico, activities included documenting contemporary knowledges, community agroecological workshops, guided visits to an institutional meliponary, and promoting school gardens, utilizing "knowledge dialogues" as a methodological approach. The study identified characteristics of stingless bees and their cultivation, such as their ecological and cultural importance, role as pollinators, association with community values, and productive potential, making them excellent mediators for biocultural conservation and agroecological education.

Júlio Barêa Pastore, Paulo Henrique Honorato · Ornamental Horticulture · Brazil (Brasília)

The "Jardim de Sequeiro" is a naturalistic, seasonal rainfed gardening technique developed at the University of Brasilia, Brazil. The first experimental garden, over 5,000 square meters of rooftop gardens, was planted at the Instituto Central de Ciências. It relies entirely on rainfall and withers during winter drought, functioning as a temporary installation redesigned annually. Its first cycle ran from December 2020 to May 2021, yielding promising results despite pandemic difficulties.

Cleberson Saraiva · Revista Contexto Geográfico · Brazil (Serra)

This study investigated the relationship between the multifunctionality of urban agriculture and cultivated plants in the public spaces of the popular urban neighborhood Jardim Tropical, Serra-ES, Brazil. Using bibliographic, documentary, and field research, it found that these cultivated plants form a public green landscape. This landscape facilitates social relations for environmental revitalization and comfort, small-scale production of food and natural medicines, leisure, and social interaction, promoting a sense of belonging and characterizing urban agriculture's multifunctionality.

Samantha Bosco, Bradley G. Thomas · Ethnobiology Letters · United States

The Skarù·ręʔ (Tuscarora) Food Forest Project is a community-based initiative in ancestral Haudenosaunee territories (New York State) demonstrating the contemporary contributions of temperate nut trees to Indigenous food systems. This project aims to address social justice concerns in agricultural science by providing a methodological testing ground for reconciliation-based and decolonial participatory action research. It expands ongoing food sovereignty, community health, and education initiatives, highlighting nuts as important, yet lesser-known, woodland foods.

Filipi Miranda Soares, Luís Ferreira Pires, Maria Carolina Garcia, Aline Martins de Carvalho, Sheina Koffler, Natália Pirani Ghilardi-Lopes, Rubens Silva, Benildes Coura Moreira dos Santos Maculan, Ana María Bertolini, Gabriela Rigote, Lídio Coradin, Uiara Bandineli Montedo, Débora Pignatari Drucker, Raquel Santiago, Maria Clara de Carvalho, Ana Carolina da Silva Lima, Karoline Reis de Almeida, Stephanie Gabriele Mendonça de França, Hillary Dandara Elias Gabriel, Bárbara Junqueira dos Santos, António Mauro Saraiva · Biodiversity Information Science and Standards · Brazil

The "Pomar Urbano" (Urban Orchard) project collaboratively monitors 411 native and exotic fruit-bearing plant species across all 27 Brazilian state capitals. Data collection uses iNaturalist Umbrella and Collection projects, with each capital having a specific collection project. The project involves a multidisciplinary team exploring biodiversity value, creating fruit-inspired products in creative industries, and developing recipes featuring frequently observed fruits in São Paulo to promote culinary diversity.

Tina McIntyre, Rachel Gutner, Hamutahl Cohen, Tiare Saracino, Esen Momol · EDIS · United States (Florida)

This 8-page publication from the UF/IFAS Environmental Horticulture Department defines common pests for home gardeners and advocates for diversifying landscapes to manage them. It introduces the "triangle" of Integrated Pest Management (IPM), providing examples of multi-method tools applicable in home settings for pest control.

Mayra I. Rodríguez González, Christian Kelly Scott, Tatiana Marquina, Demeke B. Mewa, Jorge García Polo, Binbin Peng · Earth Interactions · Mexico

This mixed-method study in Mexico City, Mexico, explored urban agriculture's (UA) role as an alleviation and land management strategy, integrating ecosystem services and livelihoods frameworks. It quantified food production, crop diversity, six ecological processes, cultural benefits, and contributions to livelihood capitals. UA supported ecological processes, connected humans to nature, and provided supplemental income, but also showed trade-offs between ecological processes, limits in promoting formal education beyond agroecological knowledge, and an inability to fully lift families out of poverty.

Tina McIntyre, Hamutahl Cohen, Rachel Gutner, Tiare Saracino, Esen Momol · EDIS · United States (Florida)

This is a five-page extension publication from the UF/IFAS Environmental Horticulture Department that provides a decision tree to help edible-landscape gardeners decide how to respond to wildlife in their growing areas. It states that while wild animals can damage crops, this need not require conflict, and aims to help gardeners become more accepting of wildlife species present in their managed area and coexist with them.

Mary Leou, Tania Goicoechea, Bethany Kogut · Catholic education/Catholic education (Dayton, Ohio. Online) · United States (New York City)

A report on "Bees Alive!", a civic ecology program run over three years by the NYU Wallerstein Collaborative for Urban Environmental Education & Sustainability in Greenpoint, Brooklyn, New York. A university, public schools, non-profit organizations and the Lentol Garden community garden collaborated to establish a native-plant pollinator garden, funded by EPA Region 2, using place-based education and experiential learning theory to create an outdoor classroom that supports wildlife and teaches the public about pollinators.

Stacy M. Philpott, Azucena Lucatero, Sofie Andrade, Cameron R. Hernandez, Peter Bichier · Insects · United States (California)

This study examined how native plant species richness, garden management, and landscape composition affect the abundance and richness of native and non-native bees, ladybeetles, ants, and ground-foraging spiders in urban community gardens (urban agroecosystems) in California, United States. Native plants — about 10% of species but only about 2.5% of plant cover — had little influence on arthropods overall, with the only significant effect being a negative one on non-native spider richness, likely reflecting native plants' low cover. Garden size increased native and non-native bee abundance and richness and non-native spider richness; floral abundance increased non-native spider abundance and native and non-native spider richness; mulch cover and tree/shrub abundance increased non-native spider richness; and natural habitat cover increased non-native bee and native ant abundance but was associated with fewer native ladybeetle species. The study concludes that native plant richness does not strongly influence the abundance and richness of beneficial arthropods.