I have a perfect solution for your prob. This spray is perfectly fine for bud plants. First, get a bulb of garlic, 1/4 onion, 1 tbs of cayanne pepper, 1 tbs of liquid dish soap, 4 cups of water. Crush the garlic bulb mincing it fine, chop up some onions nice and small, mix the garlic and onions in 4 cups of water. Add the cayanne pepper, mix that up, and let it sit for about an hour. Finally, add the tablespoon of dish soap, strain the onions and garlic out, and your non-toxic spray is ready! It can sit for a week in the refrigerator, and get rid of gnats within a week!