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. Bag of 7 kg. Covers up to 310 m² (3,300 ft²).