Larry - I seem to have had the opposite conclusion about the very last 4 daylilies that I acquired. They were from Maryott's. I received and planted all of them the end of September. I received: Marilyn Morss Johnson, Zoe Allegra, Get Jiggy, and Winter Rainbow. 3 out of the 4 now have quite a bit of rust on them, the other 1 has some rust but not a lot of rust.
Most all the daylilies in the raised bed were acquired this year. Most of them in the late summer or very early Fall.
