Community gardens provide fresh produce and plants as well as satisfying labor, neighborhood improvement, sense of community and connection to the environment. They are publicly functioning in terms of ownership, access, and management, as well as typically owned in trust by local governments or not for profit associations.
Community gardens vary widely throughout the world. In North America, community gardens range from familiar "victory garden" areas where people grow small plots of vegetables, to large "greening" projects to preserve natural areas, to tiny street beautification planters on urban street corners. Some grow only flowers, others are nurtured communally and their bounty shared. There are even non-profits in many major cities that offer assistance to low-income families, children groups, and community organizations by helping them develop and grow their own gardens. In the UK and the rest of Europe, closely related "allotment gardens" can have dozens of plots, each measuring hundreds of square meters and rented by the same family for generations. In the developing world, commonly held land for small gardens is a familiar part of the landscape, even in urban areas, where they may function as mini-truck farms.
Community gardens encourage an urban community's food security, allowing citizens to grow their own food or for others to donate what they have grown. Advocates say locally grown food decreases a community's reliance on fossil fuels for transport of food from large agricultural areas and reduces a society's overall use of fossil fuels to drive in agricultural machinery.
Community gardens improve users’ health through increased fresh vegetable consumption and providing a venue for exercise. The gardens also combat two forms of alienation that plague modern urban life, by bringing urban gardeners closer in touch with the source of their food, and by breaking down isolation by creating a social community. Community gardens provide other social benefits, such as the sharing of food production knowledge with the wider community and safer living spaces.
Source from Wikipedia
Gardens on non-City land
Gardens on City land
Gardens in City parks