Hi. Five years ago, while I was seriously ill, a seedling came up behind our greenhouse, next to the boundary wall. In ordinary circumstances, I'd have pulled it out, but it was already around five feet high when, three years later, I resumed gardening. Now it is over twenty feet high! I was glad it came up, because it provides a green backdrop to my small garden and provides a screen from the houses behind, but obviously if it is a large tree I'll have to have it taken down asap. It has a divided trunk (i.e. two trunks) of a pale, greyish colour, and single, mid-green, serrated, single leaves alternating rather than in pairs. They look rather like the leaves of a hornbeam or wild cherry, but I can find no catkins, flowers or even seeds, though there must be something, I suppose. Any guidance would be gratefully received!
