Hi Ellen, I plant them out in late spring or early summer, then water and feed like crazy. Once you decide to dig them up, be prepared to dig deeply, just as for x-powellii -- probably at least 15 inches down to the basal plate. Jim At 01:12 PM 8/28/2010 -0400, you wrote: >Jim Shields writes: >>....USDA zone 5 and warmer. > >Jim, I had no idea C. bulbispermum might be hardy here. When do you find >is the best season to set it out? I have a few here, and I didn't know >what I was going to do with them...but now I do! > >Ellen ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344 or toll-free 1-866-449-3344 in USA