I am going to be planting my foundation plants next Spring and would like to know if anyone has Sweet Bay Magnolia and would like to know how fast it grows? My concern is it will be going over a drain tile and I am thinking that it's roots may get into the tile. By the way it is going on the conner of my house. My next question is what would be a tree that would or could take it's place? It is on the Northwest conner of the house, so yes it gets shade. Can you prune a Magnolia Tree to keep it a one size? I really need a expert answer from some one that had dealt with this tree in the past and has knowledge about how they grow.