 Hi, this is Josh Zamzo, and there are many shades of the color green. For example, there's lime green, kelly green, and our favorite here at Zamzo's, huma green. It's true, huma green turns lawns such a deep dark green, it really is a color all to itself. In fact, what causes your lawn to turn such a deep dark green is the natural iron and trace minerals that are in every bag of Zamzo's huma green.