A former arsenal of the 19th century defense system of the La Maddalena archipelago gets transformed in a garden space for non-indigenous plants invading in the natural park: agave, aloe, eucaplyptus and carpobrotus. The provenance of the plants (America, Africa, Australia) gets displayed on the inside of the wall with a murales-technique. The project was reslized during the international workshop "LandWorks Sardinia 2013".