Steve Burger wrote: >I have some small individuals of this plant and hope to get them through >winter in the ground >here in a moist 7b. Does anyone have much experience >with this one, or know anecdotally how >hardy it is? Steve, I have read that C. oliganthum is cold hardy to Zone 7 and being in the americanum/erubescens line this is believable. This is my first season with this plant and I intend to winter it in the ground in a moist sheltered position with a bit of extra mulch. I am fairly confident I will see this one pop back up next spring. Regards, Jay Central North Carolina, USA (USDA Zone 7b)