Organic Control’s Plant Pro-Tec Deer & Rabbit Repellent from Orcon has a 100-percent organic formula that uses highly concentrated garlic oil to keep animals from damaging gardens, and a patented, long-lasting and easy-to use delivery system that sets it apart from less effective spray-on repellents. Plant Pro-Tec’s unique biodegradable, patented delivery system releases the active ingredients slowly over time, keeping the odor strong and effective for between six to eight months, even in the rain or snow.