The "YardPRO» 21-0-7 granular lawn fertilizer from "Green Flag" is suitable for a spring and/or summer fertilization. Fertilizing in spring helps with quicker greening and prepares your lawn for the stresses of summer by strengthening roots. This lawn fertilizer is free of nitrates and phosphates. 7 kg. Covers up to 620 m² (6,600 ft²).