Ladybugs or some sliders and put em right onto plant. If there's food on it they will stick around until it's gone. Inside I've had ladybugs and praying mantis at different times. Ladybugs can be fed warm honey water and give them a papertowel to drink water from and they will mate and survive for a few months. I gather mine in summer/end of september and keep them in a habitat with leaves, sticks, etc. Just make sure to change out honey water and paper towel frequently. F gnats.