It is late April in Maine (5b-4a), and the columbine and iris are just peeking out. Every year I have problems with budworm in the iris and columbine worm in the columbine. I'd like to try to get them early with Neem and/or insecticidal soap. Can either of these harm very small plants (probably not the iris, but maybe the columbine?)
Any other suggestions for coping with these would be appreciated.