I'm writing from Vancouver Canada. In the courtyard of the housing co-op we have a magnolia that's been growing there for years. In the last month or so I've noticed that the leaves of the tree are yellowing and dropping off. They are everywhere.
I know nothing about the maintainance of magnolias but the full-scale shedding of leaves, at the beginning of summer can't be normal. What is wrong with the tree and what can we do about? Any advice would be appreciated.