(May) I have planted zinnias in a "butterfly flower bed." Something is eating
them up and because they are in a bed I want to bring butterflies to, I don't
want to use an insecticide on them. What can I do?
If you aren't sure what is eating your zinnias, it is quite possible that it is some small caterpillar. Anything that would kill a chewing insect, would also kill any caterpillars -- the precursor to the butterfly. For now, simply live with the damage, and see if you can investigate to find out what the culprit is.