I've never seen Zebra Swallowtails here...and of course, the host plants don't grow here! I have Hop Trees also and they're used by Giant Swallowtail and Two-tailed Tiger Swallowtail. The Eastern Tiger Swallowtail only uses my black cherry trees and the native ash tree, at least so far.
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority. E. B.White
Integrity can never be taken. It can only be given, and I wasn't going to give it up to these people. Gary Mowad