I found a Chinese elm dug it up this fall put it in a grow box, it has a 3/4” trunk got quite a few fine roots, 3’ tall, leafs died back almost immediately. I currently have it in an unheated greenhouse, I did a scratch test and trunk is still green under bark, what is my best option with this tree , leave it in greenhouse and see it it leaf’s out in the spring or cut trunk 3-4” above ground and bring it inside to the warmth and see if it will start to produce branching or even start to grow would this give me a head start on next year? Any advice would be great thanks.