The plant called "Rose of Sharon" is not a rose, but a species of Hibiscus (H. syriacus). While there will likely be people on this forum who are familiar with Hibiscus, your best bet is to ask on the actual Hibiscus forum. I'm putting a link to it below. Good luck!

:-)

~Christopher

Here is a link that might be useful: Hibiscus Forum at GardenWeb

Karla, "Althea" or Rose of Sharon, is an extremely hardy, persistent plant. They root EXTREMELY easily in water and (at least in my climate) can be dug, pruned and transplanted as long as they are still dormant (without leaves). They can be severely pruned and will explode back into growth and flower as much bushier plants. If you're in an area still experiencing severe winter weather, wait until your extremes are over and prune them after your chance of last frost. At that time, you can probably transplant them easily and safely. Just keep them watered if you aren't having rains. Good luck and have fun with them. They're great plants! Kim