I've been using GrassRoots for10 years or more. Tried four other companies for several years each prior to GrassRoots, but never got the yard looking like I wanted. Grass was not lush and had lots of yellow in it. I get frequent complements and questions about how I keep it so dark green and lush, so my answer is always the same - it took two years with GrassRoots and they get all the credit for the transformation and continually improving appearance since then.