How to Check for Thatch?
A lawn that has too much thatch will feel spongy and tend to scalp when mowed. To estimate thatch thickness, use a soil probe, spade, or knife to remove a small section of sod. Measure the thatch layer with a ruler in several places around the yard. If the estimated thatch thickness is greater than inch, plan to use mechanical dethatching practices in the near future. How to Control Thatch Thatch control is a preventive and curative process. Thatch prevention can be achieved through proper fertilization and mowing. Avoid applying nitrogen at a rate exceeding one pound per thousand square feet. Maintain adequate, but not excessive soil moisture to encourage thatch decomposition (deep and infrequent watering – 1/2 inch every four days when dry). Use composted or organic materials for topdressing sparingly and lightly. Adding highly organic materials adds to the already decomposing organic thatch layer and can increase thatch problems. Dethatching and core aerification are curative practi
