Remove any leaves and twigs that might have accumulated on your lawn over the winter using leaf rakes and similar tools. Cleaning up these old debris paves the way for easy application of herbicides and fertilizers. Under normal circumstances, you’ll only need to overseed twice a year unless your lawn suffered severe damage in winter. Spring is the season when your lawn needs maximum attention after it has endured all the harsh conditions of winter. Whatever you do during this season will determine how healthy or unhealthy your lawn looks for the next several months.