Here's how to grow a lush lawn in a hurry: Scotts Turf Builder Quick + Thick Grass Seed Bluegrass Sun Mix 12-0-0. Grows grass 2X thicker in just 14 days. Our exclusive mix contains our highest quality grass seed plus a special blend of slow-release fertilizers. So, seed not only gets a quick start, it grows into thick, green grass that lasts. 99.99% weed-free grass seed made just for sunny areas. Ideal for overseeding existing lawns. Great for establishing a new lawn on bare soil.