I found three Black Swallowtail caterpillars on my fennel plant the other day. I was sort of surprised to see them on the fennel plant because last summer they were on my parsley. Nicknamed parsley worms, the caterpillars feed on parsley as well as dill, fennel and other members of the carrot family.
I have planted herbs to cook with and share with the butterflies. If one wants to see butterflies then it is necessary to share one's herbs.
As of today two have moved on to become pupae. I thought I could see where they wandered off to because my garden hasn't filled out yet. I've had no luck in finding them. Where they go is a mystery. One would think that they are nearby.
One is still on the fennel, but not for long.