When growing fruit trees, etc in pots, in winter it is more important that you keep the roots frost free, ie protect the pot. Keeping them in the greenhouse would be ideal, but be careful in the spring not to let them start growing too early. Harden them off by leaving them outside during the day, and only putting them in the greenhouse if a hard frost is forecast.

With regard to your cherry tree, if you scrape a bit of the bark away at the base of the tree, and its green underneath, then the tree should be all right next year. If its brown and dry under the bark then it is most likely dead, in which case you should take it back to the nursery you bought it from. Any good company guarantees its stock, so you should get your money back or a replacement.

valmarg