When to move...?
We have just moved from Louisiana and have a lot of questions: When is a good time to thin out and move irises? roses? daylilies? Should we store spent bulbs (tulips, daffodils, crocuses, ranunculus)? or replant them now? (We had them in a large pot for spring and want to plant them in the ground for next year.)
The bulbs of daffodils, tulips, crocus, and ranunculus should be dormant now. Best wait until late summer or early fall to plant them. For now, you could leave them in the pot, or dig, let them dry for a day, then store in a cool, dry space.
For iris and daylilies. an extension publication says, "As a general rule, divide summer- and fall-blooming plants in spring and spring-blooming plants after they’ve bloomed or in the fall. Don’t cut apart a plant when it’s blooming."
So divide Iris after bloom, in July, August or Sept. This website shows you how to divide and replant.: http://www.irises.org/About_Irises/Cultural%20Information/Grow_Bearded.html
Divide daylilies after blooming in late summer or early fall.
Roses can be moved after they have gone dormant, after a frost. Dormant plants won't suffer transplant shock.