Thatch development is normal in home lawns.
However, excessive amounts of thatch may be detrimental. There are many reasons why homeowners should try to prevent thatch from forming. This means that most of the grass roots will be growing in the thatch, not the soil. Since thatch is not capable of holding much water, the grass will be more susceptible todrought. Also, thatch does not offer roots or grass crowns much protection from temperature extremes.