Answer: Although magnolia trees are considered evergreen, it doesn't mean individual leaves can last forever. Most broadleaf evergreen trees and shrubs shed the oldest leaves early in the growing season to make room for new leaves. I'd say your magnolia is behaving in a perfectly natural and normal manner. I don't think it's necessary to water your mature magnolia. At 30 years of age it must be well established and should be quite happy with only natural rainfall.
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