I tried everything. Aluminum foil, lemon essential oil, even putting rocks in the planter to make it difficult to dig in. Now I put too much, water does not filter correctly and I have mold starting to grow under the rocks. Some plants I can hang, but some others I cant. Leaves are chewed up and starting to fall. My cats are like almost 2 years old and have plenty of toys/scratching post to play with. They dont destroy anything but the plants they just wont let go!!!