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 market gardens. They also practice crop rotations with versatile plants such as peanuts, tomatoes and much more.