Viewing post #2826682 by sooby

Macrocentra said:
I went away for a few weeks and just got back, and found it suddenly exploded into many beautiful purple blooms! An unexpected but pleasant surprise. The temperature recently dropped quite a bit (near freezing), which must have triggered it.

Someone correct me if I'm wrong but for fall flowering asters I think it is more likely daylength (which is really a misnomer since plants really measure the length of daily darkness) that initiates flowering rather than temperature.