I think I posted this question on the perennials forum and am still confused. I planted some Catlin's Giant a few weeks ago and also have some 'Bronze' something -- both are suffering a strange wilt. Part of each plant wilts and eventually dies and the stolons of that part look black. I'm not watering too much - we just had 3" of rain three days ago and it is allowed to dry out between any waterings. Is that the problem? It doesn't look dry - it looks sick.

TIA,

Westy