On May 27, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:
I think I have this plant - it is very uncommonly sold - usually sold only at speciality native nurseries due to its unremarkable shape. It have interesting seedheads (mine hadn't bloomed). I have one planted in partial shade very close to one of my pond - it have its roots constantly wet by direct contact with water (pea gravels are used). It require constantly wet soil.
This plant has been said to grow in the following regions: