Sustane 4-6-4 All Natural Fertilizer promotes a rapid rate of vegetative establishment. Suståne replenishes the soil with a rich supply of humus (stabilized organic matter) and all 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 4-6-4 All Natural provides a combination of plant nutrients and organic substances derived from biologically stable compost plus natural potash and feather meal. OMRI Listed, available 5lb and 20 lb. bags.