SunBlest utilizes the very best in dry granular fertilizer products which utilize Polyon controlled-release urea to slowly release the nutrients over time to better enable an equal feeding between services. In some services we also utilize products with iron which contributes to a dark green color. We also work into the late summer and late fall services, phosphorous into the blend to enable better root growth with the lawn needs it the most. This has largely been eliminated from most programs on the market today.