My herbs and arugula have been chopped off evening and left in a pile beside the plant. Now a small woody plant is getting destroyed on one side---same thing. Very neatly cut at an angle, each about 3-4 inches long and and in a pile--not eaten. It's been going on for several weeks now. The parsley is gone. The lettuce pulled out by the roots and left without as much an a bite out of it. They are all in pots on a second story deck but there are trees nearby so I am thinking birds or squirrels--perhaps chipmunks? It seems to happen at night or early morning before I notice. Anything recommended to discourage critters? Netting might work but anything with an odor that might discourage this? I'm afraid my tomato plants might be next.