They'll probably need protection their first winter or so -- wrap them with burlap, or make a chickenwire cage and stuff it with fall leaves in order to protect the foliage from cold and wind -- but they should do great; this cultivar's survived as far north as Long Island.

Also, they'll be susceptable to root rot the first winter; make sure they're planted with the rootball close to ground level, not buried deep, and that any mulch the landscapers put down is a couple of inches away from the trunks.

Good luck and look forward to next spring's blooms!

Jim