Suståne has been the world's leading manufacturer of organic and natural slow-release fertilizers since 1988 — trusted by professional growers, horticulturists, and farmers in over 60 countries. Every Suståne product is built on a foundation of aerobically composted turkey litter combined with plant nutrients and soil-amending ingredients, forming a biologically active, homogeneous granule that feeds plants and rebuilds the soil at the same time.
Unlike synthetic fertilizers that deliver a quick nutrient hit, Suståne's slow-release nitrogen feeds steadily, improving soil structure, porosity, and moisture retention over time — while also introducing beneficial microorganisms that suppress pathogens and support healthy root environments. Suståne products are USDA Biobased Certified and OMRI Listed for use in certified organic production, making them a clean, reliable choice for growers who refuse to compromise on quality. Backed by over 800 independent studies, Suståne is the most thoroughly researched organic fertilizer on the market.
