I know that Mother Earths Lawn Care does organic lawn treatment and services in the Madison area. At first I just used their landscape maintenance services for mowing, mulching, etc, and used TruGreen. I use to live in Sun Prairie, but then moved into Middleton. I met their owner one day and ended up talking with him for a long time about the different natural and organic products that they use for both fertilization and weed control. The guy said that what they use is safe around kids, pets, and even for the lakes. I know that their website is www.motherearthslawncare.com
and you can call them @ (608) 695-7642.