Found a cool little glitch that allows me to set up a wintumber tree anywhere in a POH.
Here are some pics.
Wintumber tree in dining room table:
Wintumber tree on throne room trapdoor:
Wintumber tree on a throne:
Here is another one I found:
Deleted one of my two thrones :o (Impossible to do in building mode as building 1 throne will builde both)
The wintumber trees are permanent and stay if i leave house/logout.
The deleted throne is not permanent.