How to scarify your lawn in Spring Over time, the base of a lawn becomes congested with thatch and moss which inhibits airflow around the grass. And moss, if left to flourish, can take hold entirely. Before you scarify, mow the lawn, this will give you better access to the thatch and make the while process easier. Using a spring tine rake Gently pull the rake back multiple times while criss crossing your way over the lawn. Mechanical scarifiers do the same job with reduced time and effort. Be ca