It is one of the few plants that can thrive in our dry and hot summers.
Hmm two conflicting statements, I have said for a while(without any proof) that when we have a dry period early that Knapp weed does great, waiting to see if it holds this year. also over the years if we don't get a reasonable amount of rain in early July, the goldenrod under performs. Your dates may vary (put in as a good politician would require)This fills a hole between linden and goldenrod. Most years, unless there's a drought, I don't have a dearth because of how different things come one after the other.