I can report that this plant is very vigorous and completely hardy in zone 7a, so long as it's provided a south facing microclimate, such...Read More as a raised bed against your home or behind a stone retaining wall. I've grown it twice now in different spots. It will come back from the roots. Looks best intermingling with ferns or other part shade plants, as it's a bit leggy. Can be cut back to achieve a bushier form. Mine blooms reliably from late spring to frost. Quite the conversation piece.
I can report that this plant is very vigorous and completely hardy in zone 7a, so long as it's provided a south facing microclimate, such...Read More