21-0-9 is a spring-summer-fall fertilizer for established lawns. It is a nitrogen-rich, phosphorus-free granular fertilizer designed to maintain a vigorous lawn while preserving the environment. When used regularly, its potassium content also helps your lawn to develop good resistance to the stresses and strains of winter. Potassium also helps improve nitrogen assimilation.

The 10 kg bag covers 418 to 836 m2 (4500 to 9000 ft2) and the 20 kg bag covers 836 to 1672 m2 (9000 to 18000 ft2).