general care of a newly potted magnolia stellata

Erm...how do you mean 'newly potted' - have you dug it up out of the garden? I ask because Magnolias hate root disturbance. Re siting, they like a cool root run, so you might like to make sure the container is kept well watered in the summer and is in a shady place, tho the plant will like to have its head in the sun. I have a M. stellata in a pot (don't want to plant it out as I wish to move house at some point), it's not flowering too well unfortunately, while the one I have in open ground is doing very well indeed. Just some thoughts, hope they help.