Hi. I have an Oyama Magnolia. It is about 3 years old and is in a raised bed near an eastern wall. It is covered with flower buds and has a lot of leaves, but the leaves are turning brown, then crispy. Can anybody help with this? Should I remove the leaves as soon as they start turning. Is it too much or too little water? This happened two years ago. It has been very hot (over 30C) and humid for nearly a week.