Banish moss and grow a lush lawn with the help of Scotts Turf Builder Triple Action for Moss Control. This 3-in-1 lawn care product kills moss, feeds grass for a healthier, greener lawn, and thickens grass to help protect against future problems. Ideal for use on most grass types. Apply during winter or spring when moss is actively growing. It is best applied when the lawn is moist and tall grass has been mowed to expose low growing moss. We recommend using a Scotts spreader to apply this product. Grass blades may temporarily turn black after application; however, this condition will disappear after mowing. Always wait 6 to 8 weeks between applications.