Where are the Butterflies?

I loved to plant these fennel in my gardens down south. They attracted butterflies that would lay their eggs and then the larvae would eat on them. It was awesome to watch what seemed to be such a simple cycle of life each and every day. The chrysalises. Explaining to the children that came in to the garden center what was going on.

I miss that.
So I tried...here in the midwest. Nothing...but this little wasp feeding on it.
Maybe the summer was just too cool.