RE:darker lawns
Why don't you simply ask the person?
Possibilities-milorganite-it is black in color, you need to apply quite a bit so when first applied it will look black. Due to high PH iron is locked up in our soil. Applying one of the iron supplements-IRONITE will darken the green color.
For me-it is all a balance. If, you fertilize too much you will need to mow more, water more. You will also be feeding the weeds and you will get more fungus. Watch the gardeners on the common ground. They get good results and they do look at economics.
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