Doesn't sound good I'm afraid. I just took mine in a couple of days ago when I notiticed that some leaves were starting to yellow (but new leaves are fine and trunk is solid). None too soon as last night we had a real frost for the first time. How are the youngest leaves? If the trunk went mushy, it's too late. My mistake was forgetting about an allamanda vine. It froze last night. It's been deceptive because October was soooo warm and the cold came suddenly.--My maple tree leaves are still summer green.

So nothing can be done? can it be cut back? maybe the root system is still ok?

will these type of trees come back or are do they grow as annuals only?

only the newest shoots of the tree is mushy...the main trunk part is not.

Bring it inside- garage, basement etc, cut it back below the mushy part.
We cut our main trunks down when they get to tall and they always branch for us.
Good luck and hurry with the greenhouse!

Oh my if you only knew the heartache....and the frustration...I'm really trying to get someone to help me with the GH and I think I may have finally found someone!! If I want to pay some $500-$800 they would be lined up.

I just cant justify that...so I'm in begging mode (family, etc) and have made calls to previous workers who might know someone who can help...