Outdoors it can be anything, Caterpillars, Inchworms, Cabbage Loopers, Leafhoppers you name it. Place this one on a stand or off the ground that will help it recover and protect it from these critters. Second you can spray your leaves, especially underneath the leaves. Fatty acid salts or insecticidal soaps and even neem oil I've heard. You'll need a mister to apply any of these if you choose to go this route. Hope this helps and don't let the critters harvest the plant before you lol