Guerrilla gardening is political gardening, a form of nonviolent direct action, primarily practiced by environmentalists. It is related to land rights, land reform, and permaculture. Activists take over ("squat") an abandoned piece of land which they do not own to grow crops or plants. Guerrilla gardeners believe in re-considering 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. Others work more openly, seeking to engage with members of the local community, as illustrated in the examples that follow. It has grown into a form of proactive activism or pro-activism.

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