I recently purchased a Southern Magnolia from a nursery and it was shipped to me. When I received the tree, I noticed that all of the leaves are dry, brittle, and some are broken into pieces. I have since planted it and have been trying to nurse it back to health. It is about 4-5 feet tall including the root ball, the widest part of the base is only about 1.5 inches wide. Is there anything else I can do to help it survive? The lowest limb is still green, but I am not sure what I can do for it. Thank you!