Hi can anyone tell me what this plant is ? I would like to know if it is a tree or a shrub. It self seeded in my garden about 5 years ago and not being sure what it was I put it in a pot. I quite like it as it turns this beautiful orange colour in autumn. would quite like to plant it in my garden but I am worried it may grow too big and dont want any damage to my propety caused by root invasion. would be grateful for any advice. Thank you in advance.