Can't throw a rock without hitting a lawn/landscaping business. LOTS of competition.
I hired a lawn company to seed/fertilize/aerate, etc. They come once a month, over the course of the season.
I picked them for several reasons. One, they took soil samples. Two, they use natural products. Three, they supplied a list of addresses of customers in my area so I could check out their work. The minute I saw the lawns I was sold.
Of course, (a) they could have just thrown the soil samples in the trash, and (b) they could be putting any old chemical on my lawn and I wouldn't necessarily know any better, and (c) I suppose they also might have just driven around my neighborhood and recorded the addresses of all the best looking lawns :frown: So it also helped that they were an established company with a good rep.