There’s been a great deal of research undertaken on the benefits of this form of collective gardening: community gardens attract people from the entire social economic spectrum, regardless of race, gender, religion or age. In short, a community garden is where people come together to grow food and flowers, they share all the work and they share the produce.

Here's an article from Greenside Up listing five good "what's-in-it-for-me" reasons to join a community garden: http://greensideup.ie/5-reasons-join-community-gardens-are-good-for-us/