Although fresh and healthy food is widely available in the United States, many American households are unable to afford it, resulting in food insecurity. Gardening for food can help address food insecurity; however, many urban households are unable to garden where they live. An alternative for such households is community gardening, in which gardeners collectively produce food on shared land. However, land in urban areas is often difficult to come by, and novice gardeners are prone to early failure. This paper describes an agent-based model that was used to examine how social influence among neighboring households in an urban community can help to encourage sustainable gardening adoption. Experimental results demonstrate that allocating more land for community gardening is unlikely to yield widespread and sustainable gardening adoption and success without also providing gardeners with training and support. If adequately supported, gardening may offer a path to greater community food security.