Answer: Browning of the leaves, especially at the margins, can indicate a fungal disease. Since your magnolia is in a container, it might also indicate salt burn (from built-up minerals in the soil). At this point, I'd continue to water on a regular basis and wait until the weather cools so you can repot it with fresh potting soil and inspect the root system. This fall, repot your magnolia with new potting soil and check the roots - healthy roots will be a creamy white inside; dead or dying roots will be brown or rusty colored. Prune away anything that is not healthy and repot your magnolia. Water it thoroughly after repotting. Wait until spring to do any pruning or fertilizing. When new growth begins in the spring, prune away the dead leaves and a few inches of each stem to encourage the development of healthy new growth. Fertilize lightly with a half-strength dilution of liquid fertilizer, repeating the applications every 2-3 weeks during the growing season. Be sure to place your magnolia where it will receive full day sunshine. I think it will bloom for you next year if you follow the above guidelines. Best wishes with your magnolia!
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