Messinas Deer Stopper Barrier Ribbon is the only perimeter protection system of it kind to repel deer, moose, and elk from bedding down or foraging areas. Just string ribbon up 30" high above ground and surrounding your garden making sure that the ends meet. Works by smell, taste, and feel and is made of organic ingredients that lst up to 30 days. Re-treat barrier with Messinas Deer Stopper for additional 30 day periods of protection.