Espoma Organic Spring Lawn BoosterNatural Organic Lawn Fertilizer With Calcium to strengthen the lawn and protect from disease. Wont burn lawns or leach out of soil Provides long lasting nutrition Creates healthy lawns & soil Requires less frequent mowing Where to use: For use on all lawns including newly seeded and sodded areas when used at the feeding rate. Apply in the Early Spring: Cool Season Grass Apply in February, March or April Warm Season Grass Apply in January or February