permablitz
n.— «Palmer is one of the inventors of the permablitz, an event in which people donate time and plants to help create an environmentally friendly space growing fruit, herbs and vegetables. The phenomenon began in April last year but is gathering momentum now. Almost every weekend a permablitz changes a suburban garden somewhere in Melbourne.» —“Blitzing the ‘burbs” The Age (Melbourne, Australia) July 16, 2007. (source: Double-Tongued Dictionary)