Hello - First off, let me apologize, I am not a pro, but I read these forums religiously. There is a ton of great information here for pros and non-pros alike. I am hoping you may be able to give me a little advice. I have always been a country boy, never really caring about my grass (when you have acres, it is too much to worry about). Now I am in a country sub with just a few acres and a sprinkler system. People here take their lawns very serious, so out of respect, I am trying to also. I just moved in last fall, so all I have done so far is winterize last fall. I noticed then that the grass was not as deep green as everyone else's. Now here (in Michigan) the weather is warming up and everyone's grass is coming in nice and deep green again and mine is a lovely shade of bright lime green. Is there a special fertilizer composition I should look for to green up my lawn? I have a decent amount of thatch build up, so in the next few weeks, I plan to core aerate, over-seed and fertilize. Any advice you can give me is immensely appreciated. Thanks again for your help and this great site.