This is a great time of year to plant a tree, so here is some great advice from England:
we used to dig a deep round hole and fill it with rich tree compost which we planted the tree into. We now know that this encouraged the roots to stay in the planting pit; rather than spreading out laterally in search of nutrients and moisture, they grew in a circle. In severe cases the roots became almost “pot-bound” and there were few wide-spreading roots to anchor the tree into the ground.
POLLENATRIX 