Guerrilla gardening is gardening on land that the gardeners do not have legal right to use, often an abandoned site or area not cared for by anyone. It encompasses a very diverse range of people and motivations, from the enthusiastic gardener who spills over their legal boundaries to the highly political gardener who seeks to provoke change through direct action. The land that is guerrilla gardened is usually abandoned or neglected by its legal owner. That land is used by guerrilla gardeners to raise plants, frequently focusing on food crops or plants intended to beautify an area. This practice has implications for land rights and land reform; it promotes re-consideration of land ownership in order to reclaim land from perceived neglect or misuse and assign a new purpose to it.
Some guerrilla gardeners carry out their actions at night, in relative secrecy, to sow and tend a new vegetable patch or flower garden in an effort to make the area of use and/or more attractive. Some garden at more visible hours to be seen by their community. It has grown into a form of proactive activism or pro-activism.