Answer: Magnolias can take a little time to become established and until they do, should be given a little extra care. In your gardening region, where temperatures are hot, your magnolia will appreciate a deep soaking twice a week. It's normal for the tree to shed some leaves while it's getting established, so don't let a few yellowing or falling leaves concern you. As for the black leaf margins - it's usually a sign of salt burn caused by over-fertilizing or excessive salt in the water (or soil). Flooding the soil when you water will help leach some of it away. I think when your magnolias have firmly established their root systems they will begin to adjust to their new surroundings. In the meantime, water deeply twice a week. Best wishes with your landscape.
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