Sustane 8-2-4 All Natural Slow Release Nitrogen Fertilizer provides 6 - 12 weeks of nitrogen in the organic slow release form. Suståne replenishes the soil with a rich supply of humus (stabilized organic matter) and all of the essential nutrients required for quality growth. Suståne Increases the nutrient and water holding capacity of the soil, while Strengthens plants tolerance against hot dry conditions. Suståne 8-2-4 All Natural provides a combination of plant nutrients and organic substances derived from biologically stable compost plus natural sulfate of potash and feather meal. OMRI Listed, Apply 12.5 lb. per 1000 sq ft.