Which practice is used to reduce thatch and keep the thatch layer under 0.5 inches?

• A. Keeping the thatch layer less than .5 in
• B. Aerating annually
• C. Fertilizing heavily
• D. Pruning the lawn

Answer: (A)

Reducing thatch to under 0.5 inches relies on promoting the breakdown of organic matter and improving conditions for microbes that decompose thatch. Aeration, especially core aeration, achieves this by removing plugs of soil and thatch, which relieves compaction and creates open channels. Those openings let air, water, and microbial activity reach the thatch layer, speeding its breakdown and preventing it from accumulating. Doing this annually helps maintain a thin thatch layer because the added space and improved conditions continually support faster degradation of organic matter. Merely aiming to keep the thatch under a certain depth isn’t a management action by itself, and heavy fertilization tends to add more organic matter that can worsen thatch, while pruning addresses shoot growth rather than the thatch layer. So the practical, effective method to keep thatch under control is annual aeration.