Cloudless sulphurs are just one of several species which migrate. They are starting their migration now. and their numbers will increase into September. I will still be seeing them in October and some stragglers in November. My cypress vine, a favorite nectar plant, is just beginning to bloom; it will be full of sulphurs later this month and into September. Yes. Yours migrate. They can't survive the cold. [An aside: I just looked out the window at my zinnia patch -- 9:45 a.m. -- I saw at least 3 gulf fritillaries, 2 cabbage whites, a tiger swallowtail, a cloudless sulphur, several silver spotted skippers, and probably some fiery skippers (I'm too far away to tell). The bed is really jumping with butterflies today. I love it.] Some of the migrating butterflies winter over in south Georgia, but not many here. Our winters can be too cold. A plant called a cardinal flower, a species of lobelia, grows wild in Georgia and is just getting ready to bloom; I have a couple of them which will bloom in the next week or so; they are a favorite nectaring site for cloudless sulphurs as they journey south.
The easement will be full of butterflies from now through October; my senna is about to bloom (a host plant of the cloudless sulphur). The sensitive pea is starting to bloom, another favorite of the cloudless sulphurs and the sleepy oranges. It's going to be pretty today; I'm sorry I have to go to work.