the activity of growing plants or vegetables on any piece of land in a city that you do not own, especially land that is in bad condition because it has not been used for a long time. People do this so that cities will have more green areas and be better places to live.
—guerrilla gardenernoun [countable]
Guerrilla gardeners came late in the night and turned the area outside the building into a vegetable patch.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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