Is the following statement true or false: Not collecting clippings causes thatch?

• A. True
• B. False
• C. It may cause more thatch in dense lawns
• D. There is no effect

Answer: (B)

Thatch forms when dead plant material accumulates faster than it can be broken down by soil organisms. Grass clippings are mostly water and nutrients and, when left on the lawn, they generally decompose quickly and return organic matter and nutrients to the soil. Because of that rapid breakdown, simply not collecting clippings does not create a thatch layer. The real drivers of thatch are factors like excess nitrogen promoting rapid growth, mowing too short or too infrequently, poor drainage or soil compaction, and slow microbial activity. In practice, leaving clippings on the lawn is usually beneficial for soil health and does not by itself cause thatch.