Scotts 38505 Turf Builder with Moss Control, 5,000 Sq Ft CoverageKills moss and helps develop a thick, green lawn to discourage moss from returning. Kills moss, not lawns. Guaranteed! Recommended in some areas of the country in Early Spring as part of the Scotts Lawn Care Plan. Kills moss and thickens grass to fill in bare spots Feeds to help prevent future moss problems Improves lawn's ability to absorb water and nutrients versus an unfed lawn Apply during winter or spring when moss is actively growing. When to