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Spring Lawn Service: Leaves, Dethatching, and Aeration Timing

SE WI, lawn company applied pre-emergent + fertilizer with dead leaves present. Waste? When dethatch/aerate? The expert says pre-emergent needs soil contact; thick leaves block it. Call for re-application. Dethatch only if thatch problem; northern lawns rarely need regular dethatching. Aerate in September.

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