JBtheExplorer
Native Gardener
We had eggs on our dill and parsley and were able to raise cats and set them free when they hatched. Seems like most lay eggs late summer and don't hatch till spring.
I may try to raise one just so I can see the process. I don't know how many eggs were laid, but I found at least six. Black Swallowtail caterpillars are one of my favorite caterpillars, but I've only been lucky enough to see a few over the years. Looking forward to photographing them when the time comes. Hopefully they'll survive long enough.