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In addition, avoid aerating warm season grasses during spring greenup, and not until after their first spring mowing. If you have cool season turfgrass such as Kentucky bluegrass and perennial ryegrass, both spring and fall are ideal times to aerate. before or at the time of late season fertilization enhances root growth and improves spring greenup and growth. Left unmanaged, it impedes water, fertilizer and pesticide effectiveness.