I Must Garden Animal Repellent is an environmentally safe, humane, and effective way to drive herbivores away and keep them out of treated areas. The odor of our Granular Animal Repellent triggers an innate fear response causing deer, rabbits and groundhogs to avoid treated areas. It does not harm them, but leads them to believe a predator is nearby. Instinctively, they flee the area to avoid becoming the next victim.