I've successfully transplanted and divided Eremurus. I dug them just as they were going dormant. The roots really spread out, so it's a good idea to dig about 18" from the crown to keep from damaging the roots. I re-planted them right away and they emerged the following spring with no problem.
Kabby, the foliage of mine never gets taller than 10" and some remain shorter. I've only grown the Spring Valley hybrids from Brent and Becky's, but I've read that other varieties sometimes take a year to settle in the garden before they start blooming.
