Research & reports

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.

Sandesh Thapa, Anjal Nainabasti, Sashila Acharya, Neha Rai, Rakshya Bhandari · International Journal of Applied Sciences and Biotechnology · Nepal (Kathmandu)

A key informant survey of 52 respondents was conducted in Kathmandu, Nepal, to assess the current status of rooftop gardening. All respondents expressed positive views on rooftop gardening, with rooftop farms covering 5-13% of the area. Significant monetary soft benefits were identified for food production, air quality, stormwater retention, and carbon sequestration. However, traditional methods using plastic bags, pots, and styrofoam were employed for garden maintenance. Constraints were recorded regarding rooftop farming establishment and continuation, indicating a need for proper training for efficient management.

Sandesh Thapa, Rakshya Bhandari, Anjal Nainabasti · Ecofeminism and Climate Change · Nepal

A random sampling survey in Dhulikhel, Kavrepalanchok district, Nepal, found that while all respondents perceived rooftop farming as beneficial, many could not practice it due to constraints like fear of roof damage. Practicing farmers also faced difficulties managing rooftop gardens due to a lack of proper knowledge and reliance on non-recyclable planting materials.

H. Tayal Neeraj · · Global

This chapter explores the potential of home gardening, as part of urban agriculture, to contribute to human health through improved nutrition. While home gardens can provide nutrient-dense foods, the potential health impact of soil contamination must be addressed, as urbanized soils tend to have elevated levels of heavy metals and other toxins.

Baptiste Grard, Nastaran Manouchehri, Christine Aubry, Nathalie Frascaria‐Lacoste, Claire Chenu · International Journal of Environmental Research and Public Health · Global

A five-year experimental trial quantified the food production potential, soil fertility, and potential contamination of Technosols created from urban wastes for rooftop edible production. The cropping system showed promising results for food production and maintained high fertility. However, a concern was identified regarding the trace metal content of certain edible crops, specifically zinc (Zn) and copper (Cu), although most trace metal levels were below existing norms.

Jha Ritesh Kumar, Bhattarai Natasha, KC Suraj, Shrestha Arjun Kumar, Kadariya Manahar · Malaysian Journal of Sustainable Agricultural · Nepal

This research inspected existing practices and obstacles in rooftop farming in Nagdhungha and Birauta, Nepal. Two practitioners were interviewed and 60 non-practitioners were surveyed. Results show that rooftop farming can benefit the environment by reducing atmospheric carbon and assist urban areas by reducing stormwater management costs, with a high willingness to practice rooftop farming among urban dwellers.

gökçe öcal · Journal of Planning · Turkey (Istanbul)

This study focuses on the Roma Garden, one of Istanbul's last remaining urban gardens, within the context of "DIY urbanism." In Istanbul, historical gardens are threatened by municipal policies favoring urban development, leading to the formation of "DIY" urban gardens on public land since 2013. These gardens operate without legal ties to the local state, and the destruction of urban public space over the last decade is noted as having paved the way for DIY public gardens as spaces of solidarity and shared knowledge.

Chiara Certomà, Chiara Tornaghi · Ghent University Academic Bibliography (Ghent University) · Global

This book is a collection of chapters unpacking the forms, functioning, and meanings of urban gardening in the context of the neoliberal transformation of cities. It offers an overview of diverse claims in the micro-politics of garden activism and discusses how these projects are fraught with social solidarities and divisions, empowerment and learning processes, conflicts and negotiations. The collection aims to contribute to a critical discussion of the “politics of urban space” and enrich the emerging debate on radical, critical, and political gardening.

Setyo Parsudi · Berkala Ilmiah AGRIDEVINA · Indonesia (Surabaya)

This study in Surabaya, Indonesia, aimed to identify urban farming models, community motivations, and obstacles faced in implementing urban agriculture. The study found that the most common urban farming models were hydroponics, followed by verticulture, fisheries, and rooftop gardens. Community motivations primarily included increasing income, utilizing empty land, pursuing farming hobbies, and using green open spaces. The main obstacles faced by the community were plant pests, lack of capital for development, extreme weather, and insufficient experience and knowledge in urban agriculture.

S. Alan Walters, Karen Stoelzle Midden · Agriculture · Global

Vegetable production on green roofs faces multiple challenges, resulting in minimal current activity despite its potential for urban agricultural sustainability. While intensive green roof systems are considered suitable for vegetable production, extensive systems with shallow-rooted crops like lettuce, kale, and radish show the greatest potential for sustained productivity due to building weight restrictions. Deeper-root crops like tomatoes require constant monitoring of fertility and moisture. Green roofs are not presented as a total solution for urban food provision.

Camille Frazier · Journal of Political Ecology · India (Bengaluru)

This article examines the motivations and practices of organic terrace gardeners (OTGians) in Bengaluru, India, who grow food in private spaces. While OTGians successfully create a vibrant community driven by food safety and environmental concerns, their efforts are limited to the middle class due to class-specific concerns and production practices. The study highlights that urban gardening in this context remains an intervention primarily for the middle class.

Georgia Pollard, James Ward, Philip Roetman · Sustainability · Australia (South Australia)

This paper explores the economic sustainability of home food gardens in South Australia using new data from the Edible Gardens project online survey. While saving money is a top motivation for many respondents, the study notes that it remains to be seen whether current gardening practices actually support this aspiration. The paper concludes that more work is needed to measure the full costs of different gardens to better predict their financial accessibility and economic sustainability.

Marina Silalahi, Lauresius Sihotang, Sunarto Sunarto, Fajar Adinugraha, Adisti Ratna Puri · · Indonesia (Cianjur)

A survey was conducted among 21 students at Pusaka Junior High School in Cianjur, Indonesia, to assess their understanding of hydroponic farming. Students knew the definition, methods, maintenance, and production of hydroponic plants, but literally interpreted that media like sand could not be used. While many students had experience with hydroponic farming, they claimed it was more expensive than conventional farming.

Manabika Sheel, Mohammad Bashir Ahmed, Shamim Ahmed Kamal Uddin Khan, Md. Matiul Islam · Fundamental and applied agriculture · Bangladesh (Khulna City)

A study in Khulna City from March to April 2018 interviewed 60 rooftop gardeners to analyze the scenario and problems of rooftop gardening. The study found that gardeners earned very poor economic benefits compared to their expenditures, with most preferring it as a hobby (98.33%) or for aesthetics (90%). Severe problems included excessive heat (91.67%), lack of proper nourishment (87.08%), and roof load (72.92%).

Georgia Pollard, Philip Roetman, James Ward · Kobra (Universitätsbibliothek Kassel) · Australia (South Australia)

While urban agriculture is seen as a sustainable approach to improving food security, there is a significant knowledge gap regarding the financial accessibility of urban food production for all households. If urban agriculture remains primarily a middle-class discretionary activity, its role in city-wide food security improvement will be limited. This paper demonstrates that citizen science offers an effective approach to investigate the inputs (labor, costs, water use) and outputs (produce yields, value) of urban food gardens, using the Edible Gardens project in South Australia as an example.

Silvio Caputo, Eva Schwab, Kostas Tsiambaos, Mary Benson, Hervé Bonnavaud, Neslihan Demircan, Tim Delshammar, Frederico Meireles, Nerea Morán, Jeanne Pourias · · Global

This chapter provides an overview of emergent approaches to urban gardening, identifying urban dynamics and spatial implications. It notes that a lack of suitable urban land and difficulties in establishing constructive dialogue with local authorities regarding land provision can lead to the use of interstitial urban spaces for gardening practices. An example includes a community-based organization constructing a permaculture garden on a supermarket rooftop, highlighting challenges in land access and governance.

John Crossan, Andrew Cumbers, Robert McMaster, Deirdre Shaw · Antipode · United Kingdom (Glasgow)

This paper examines community gardens in Glasgow, acknowledging their vulnerability to neoliberal cooptation where citizen work may alleviate state service provision. However, it argues that even with neoliberal practices, these gardens cultivate collective practices that suggest a progressively transformative polity. This form of citizen participation, termed "Do-It-Yourself" (DIY) Citizenship, encourages reconsideration of relationships and effective political practice.

Araceli Calderón Cisneros · Dialnet (Universidad de la Rioja) · Mexico (Chiapas)

This qualitative study analyzed the role of family urban agriculture in urban sustainability in San Cristobal de Las Casas, Chiapas, Mexico, using open and structured interviews. The visited agricultural systems showed characteristics favoring resilience and sustainability, such as low use of external inputs and recycling of domestic waste. However, a limitation found was that the contribution of own production to family consumption is very low, despite existing food, environmental, and socio-cultural motivations for its continuity.

Júlio Cézar de Almeida Lopes, Hélder Ribeiro Freitas, Eliéser Santurbano Gervásio · Cadernos de Agroecologia · Brazil

This study evaluated the adoption of a drip irrigation kit in an agroecological community garden in Juazeiro, Brazil. The introduction of the system and the social organization of the group led to low adoption of the drip irrigation system, with several farmers returning to manual watering and, to a lesser extent, micro-sprinkler systems.

Jin-Hee Ju, Won-Tae Kim, Hui Xu, Young-Han Yoon, Eun‐Young Choi · Journal of Environmental Science International · Global

This study investigated the influence of hydrophilic polymer (HP) mixture ratio on the growth of eggplant (Solanum melongena) for lower maintenance urban agriculture via green roofs. As the hydrophilic polymer mixture ratio increased, the growth index, number of leaves, leaf length, leaf width, and dry weight of shoot and root decreased. Specifically, these values were significantly lower in HP5.0% and HP10.0% treatments compared to the control, and the survival rate was lowest at 56% in the HP10.0% treatment.

Gunwon Lee, Yunnam Jeong, Seongkyun Ji, Seiyong Kim · Journal of the Korea Academia-Industrial cooperation Society · South Korea

This study aimed to improve Biotope Area Ratio (BAR) systems to address the increasing demand for urban agriculture, particularly in residential complexes where architectural and urban planning responses are lacking. It found that existing BAR systems are limited for crop cultivation because they only consider vegetation. The research proposes expanding BAR systems to include plant growth capacity factors, such as daylight, planting interval, area, and soil depth, to better accommodate urban agriculture demands.

Abdul‐Halim Abubakari, Laura Atuah, B. Banful, Hypolite Bayor · Journal of Soil Science and Environmental Management · Ghana

A study in Ghana reviewed literature and surveyed farmers on soil amendments for urban horticulture. The review found that research on soil amendments has been limited to land management and nutrient recovery, not addressing quality issues for specific production systems. Farmers adopt varying application rates due to lack of standardization, and barriers include technology for collection, funds for purchase, and labor employment.

Zhongqi Cheng, Anna Paltseva, Ireyena Li, Tatiana Morin, Hermine Huot, Sara Perl Egendorf, Zulema Su, Roxanne Yolanda, Kishan Singh, Leda Lee, Michael Grinshtein, Ying Liu, Kayo Green, Win Wai, Bushra Wazed, Richard K. Shaw · Soil Science · United States (New York City)

This study analyzed trace metal concentrations (Cr, Co, Ni, Cu, Zn, As, Cd, Pb) in 1,652 soil samples from 904 gardens in New York City. It found that many soils exceeded New York State Department of Environmental Conservation's Soil Cleanup Objective (SCO) limits for Pb, Cr, As, and Cd. Specifically, about 21% of community garden samples and 71% of home garden samples exceeded SCO limits for Pb and As, and less than 3% of all samples met criteria for unrestricted use.

Kit Yieng Chan, Michelle Chan, Oi Yan Chan, Thomas Y.K. Chan, Tsz Mei Chan, Sharon B. Chang, Kenrick Chau, Tarik Chelali · cIRcle (University of British Columbia) · Canada

Research at the University of British Columbia (UBC), Canada, investigated whether rooftop gardens could reduce greenhouse gas emissions and food transportation carbon emissions. While edible landscapes could potentially assist with climate goals, they require careful selection of crops, buildings, and resources. Preliminary calculations indicated that rooftop and community gardens would do very little to reduce the UBC campus's dependency on imported food.

Robert Mattock · · United Kingdom

This article discusses the decline in horticultural skills and work ethic in the United Kingdom over the last century, attributing it to the welfare state's de-incentivization of the workforce. The diverse plant vocabulary and cultivation skills once common among Victorian gardeners and landscape designers are now largely lost, impacting the conservation of designed landscapes. While efforts are being made to revive school gardens and promote apprenticeships and craft skills, the article concludes that more work is needed to re-establish a traditional work ethic in apprenticeships.