On Wed, 08 Aug 2012 21:23:33 -0500, Libertarian Lilly wrote:
Did I menion being in the Denver area?

No, I want something that's a true perennial, down to zone 4, please.

No you don't, at least not if you want it to flower in the normal growing
season. The cold chill is necessary for flowering to be induced. And
ripping up a perennial every year to haul it into the house is likely to
kill it in a very short period of time.

Kay