I've got a rooted cutting in an early fall of 2004. Foolishly planted it in a ground. Despite a relatively mild winter of 2004/5 it didn't make it.
Never ever had a chance to replace it.
FWIW.

Thanks for the info, George! Although it is advertised as Z5'er, the articles I found on the Internet were from the southern states. I think it was originally found in Alabama or somewhere nearby. It has been difficult to find many pictures of "older" shrubs. I had been wondering if the shrub would have the umbrella look common in other oakleafs when they droop (the weight of the blooms suggests to me that this shrub would).