best to remove the stakes as soon as possible...within 2 years of planting...otherwise the highest point of the tie...the tree thinks thats the ground and makes thickened wood accordingly.....

also with Magnolia...if a straight vigourous shoot emerges at ground level remove it.....it detracts from the natural shape....
also never root prune Magnolia...

also Magnolia are not pollinated by bees coz bees where not invented when Magnolia first colonised the world ...they are Jurassic .