Answer: Brown margins on leaf tips can indicate over or under watering or over fertilization. Your schedule of weekly watering is fine; but it could be that your lawn sprinklers are keep the soil too moist for the tree. The browning might also indicate salt burn from lawn fertilizer. If possible, redirect your sprinkler so the area immediately around the tree is watered only once each week. When you fertilize your lawn, try to keep fertilizer away from the dripline of the tree. This fall, rake and remove fallen leaves from beneath your tree and continue to water deeply once each week until fall rains take over for you. I suspect your tree will adjust to its growing conditions over time. Best wishes with your landscape!
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