I got a three-inch pot of fennel last year because I wanted more butterfly food. I haven’t had any swallowtails yet, but the plant has gone from three inches to three feet with tons of umbrels. I’m hoping for tons of seeds to go with the many flowers. I’ll spread the seed all over and hope enough comes up to lure in a few swallowtails. They’ll be welcome to eat it all. I’ve never eaten fennel. I had a dreadful experience with anisette and since then I avoid all things licorice-like.