Glad I happened onto this thread. I've had A. mollis for I think 3 or perhaps 4 years with no blooms. I moved it once thinking it just didn't like the spot, but didn't get it all so now have it in two spots. No blooms either place. I often think I've lost it because it emerges very late for me, then kind of takes off in late summer. I'll consider it a foliage plant until I get blooms and enjoy it for that.
Where/how does it become invasive? I'm sure not seeing any signs of it spreading on its own.
