Rhus Typhina died
Hi, last summer I dug up a sucker from a neighbour's tree, Rhus Typhina, & planted it in a big tub. It prospered, grew healthily.
I plan to develop it as a bush rather than a tree, and to prevent it throwing up suckers by keeping it buried in the biggest tub I can find.
For the winter I moved it into the unheated greenhouse to protect it from the worst frost. All the new branches have now fallen off and I assume it's dead.
If I try again next summer do I need to bring it indoors over winter? Is there a better way of raising it?