Build your lawn with Scotts Turf Builder Thick'R Lawn sun and shade. With this combination grass seed, fertilizer, and soil improver, you can get up to a 50% thicker lawn subject to proper care (results may vary based on the condition of your lawn). This 3-in-1 solution for thin, weak lawns helps turn your grass into thicker, greener turf with stronger roots in one easy application. Use this product to overseed your lawn once in the late spring and once in the late summer or early fall.