Green-Up Lawn Food offers outstanding performance with continuous nutrient release for up to 3 months. Green-Up Lawn Food is not affected by excessive rainfall and will yield a rich-green color within 7 – 10 days after application, if weather conditions permit. Green-Up Lawn Food can be used on all grass types. If the lawn is under stress from lack of rainfall or heat, and air temperatures are 85 degrees or higher, do not apply this product, as turf injury may occur. You may seed with this product.