Greetings to all!

I was wondering if anyone has ever tried to grow a weeping yaupon holly in a
large container. Since they grow rather large (20 feet high), would the
container help to curb the high growth? I live in Zone 6A and would love to
have one of these trees, but see that most sites list them as hardy to Zone
7. I have a heated greenhouse where it could placed in the Winter. Any
info would be appreciated.