Where have all the flowers gone?

Somebody asked me today where the sunflower fields are this summer. Good question. I've seen a few tucked away on back roads, but you have to know where to look. It's quite a contrast from a few summers ago, when seas of yellow were all over the place, inspired by Longwood Gardens' magnificent, much-photographed display along Schoolhouse Road.
(Update: I just spotted another sunflower field along Paoli Pike, east of West Chester, near where Albrecht's nursery used to be.)