most gardening stores carry live ladybugs and you dont need to let them all out at once. id let 10 or 15 out per plant when the lights go off. they will cover the entire plant. if you have aphids or mites or even white flies they can be effective. they also will lay eggs on your plants which is the reason i wouldnt let them all loose at once. you can keep them in a cool place and feed them a raisin or two and a bit of water if they dont have food