Richgro Beat-A-Bug Poss-Off contains a naturally derived bitter tasting possum deterrent for use on your ornamental plants to deter possums. It protects and feeds your plants and does not harm the possums but rather deters them from wanting to eat. Lightly spray your plants, especially new growth and flower buds daily for a few days, then approximately every 2 to 3 weeks after as a maintenance spray.