I have just moved into a house with a lovely (if a little overgrown) small, established garden that has several healthy trees in it - I don't think there is enough space for anymore trees to be planted in the ground but there is a concreted area in the shade of the house where I would like to grow trees in containers. I guess that the smaller final size of the tree, the better it will do in a container - but if i intend to plant it on in 5-6 years, could i plant a bigger growing tree?