Benefits of community gardening: what the research actually shows

The honest summary

Community gardening is linked to better wellbeing, more vegetables, more physical activity, and stronger social ties. That is the encouraging part. The careful part is that most of the evidence comes from surveys and interviews, where people who choose to garden may already differ from people who do not. Only one randomized trial has tested the effect, and its results were modest. This guide goes through the main studies, says what each one can and cannot show, and links every source so you can read them yourself.

What kind of evidence is this?

Not all studies carry the same weight. A randomized controlled trial assigns people by chance to gardening or a waiting list, which makes the comparison fair. A cross-sectional survey asks different people about their habits at one moment, which shows association but not cause. A qualitative study interviews people to understand their experience. A meta-analysis combines many studies, but it is only as strong as the studies it includes. We use these labels below.

1. The strongest evidence: a randomized trial in Denver and Aurora

In the Community Activation for Prevention Study (CAPS), 291 adults who had not gardened in the previous two years and were on waiting lists for Denver Urban Gardens plots were randomly assigned. 145 received a garden plot and 146 stayed on the waiting list as a comparison group. The trial ran from 2017 to 2019. Data collected after the start of the COVID-19 pandemic was excluded.

It found modest benefits. Gardeners ate about 1.4 grams more fibre a day and did about 5.8 more minutes a day of moderate to vigorous physical activity, which works out to roughly 40 minutes a week by press coverage of the study. Perceived stress and anxiety also fell more in the garden group. There was no significant effect on fruit and vegetable intake, the Healthy Eating Index, sedentary time, BMI, or waist circumference.

The authors describe the effects as modest and the evidence as suggestive, and the confidence intervals for fibre and physical activity were wide. Treat it as encouraging, not as proof that community gardening transforms health. The study was published in Lancet Planetary Health in 2023 by Litt, Alaimo and colleagues.

2. Vegetables and fruit: gardeners report eating more

Two older surveys found that community gardeners reported eating more produce.

In Flint, Michigan, a 2003 telephone survey of 766 adults found that people in households with a community garden participant ate fruits and vegetables about 1.4 more times a day and, by the paper's measure, were about 3.5 times more likely to eat them at least five times daily. In Denver, a 2006 to 2007 survey of 436 residents found that community gardeners reported 5.7 servings a day, compared with 4.6 for home gardeners and 3.9 for non-gardeners. About 56 percent of community gardeners met the five-a-day guideline, against 37 percent of home gardeners and 25 percent of non-gardeners.

Both were surveys of self-reported eating at one point in time, so they show association, not cause. People who sign up for a garden may already care more about food. The Denver trial above is a good reminder: when the comparison was randomized, the effect on fruit and vegetable intake was not significant.

3. Wellbeing and mental health

A 2016 meta-analysis by Soga, Gaston and Yamaura pooled 22 studies, including 76 comparisons of gardeners or pre-gardening groups with controls. It found that gardening was linked with lower depression and anxiety, lower BMI, and higher life satisfaction, quality of life, and sense of community. The authors adjusted for publication bias and the result held, although the authors also note the bias exists.

Two cautions. Many of the pooled studies were not randomized. And the studies cover gardening in general, including horticultural therapy, not only community plots. A fair reading is that gardening is associated with better wellbeing, and that community gardens are one place it happens.

4. Neighbors and community

In interviews with Denver community gardeners, Teig and colleagues found that gardeners described social processes that could build collective efficacy, meaning neighbors' shared confidence that they can work together to improve where they live. The authors frame this as a possible way gardens might strengthen neighborhoods and health, and they also point out that the evidence for gardens as a health strategy is limited. This is the kind of study that generates good questions rather than final answers.

5. What the research does not tell us

A few claims about community gardens go further than the evidence supports, so we have left them out.

• We have not cited a figure for how much money gardeners save. We could not find a reliable per-household number.
• We have not cited pounds of food grown in cities. Published estimates from secondary sources disagree, and we could not verify the original figures.
• We have not claimed that gardens cool neighborhoods or reduce crime. We did not review that research for this guide.
• Most studies are from a few places, notably Denver and Flint, and rely on self-reported diet.

What this means if you are deciding whether to garden with others

You do not need a study to know that growing food outdoors, with other people, can be good for you. The research supports a realistic version of that: expect a bit more time outside, some extra produce and fibre, a lift in how you feel, and a few new people to know. If you want to try it, see how to find a community garden near you, how to find a place to grow vegetables without a yard, or how yard sharing works if you would rather garden one-on-one.