The coloration on those plants is amazing. Are you just growing them outside? How much sun are they getting? I saw that you wrote that the photo was taken in the fall and it is dated Septbember 24. Is that accurate? I think coloration is better then.
Stovepipe (The Beast) RIP My friend.
Those plants are in full sun most of the day. Outside from Late March/April, to usually the begining of November. The date is correct. They always look really good from like July on to the end of the season.