If your tree is small enough to be able to move it, move it in the fall. Give it lots of water when you plant it and dig a hole that is at least twice as deep and twice as wide as the root ball. Add some good compost and some well rotted manure to the hole before planting the tree then fill with a mix of soil and well rotted manure.
Don't forget to give it a good watering. Also, you could add some root stimulant but, I don't think it will be to necessary.