4 6 4FINEMED50lb600wideCROPPED

4-6-4 organic fertilizer delivers a balance of nutrients, humates, compost-derived microbiology and slow release nitrogen in an easy-to-spread homogenous granule.

Suståne® 4•6•4 granular
Recommended Use 

Suståne 4-6-4 is an organic slow-release fertilizer and soil builder ideally suited for plant establishment. Suståne 4-6-4 also provides a high phosphorus and balanced N and K and Ca for bud formation during flowering.  Suståne 4-6-4 is specifically formulated to be gentle on plants, making it a go-to fertilizer for starting seed and applying to seedlings.  Allowed for use in the production of certified organic crops. Trusted by nurserymen, master gardeners, farmers, and professional growers around the world.


Suståne 4-6-4 is an all natural, compost- based organic starter and maintenance fertilizer. It replenishes the soil with a rich supply of humus and all plant essential nutrients. Suståne 4-6-4 provides a balanced mix of slow release nitrogen and other nutrients derived from biologically stable compost, natural potash, and feathermeal.

Professional Grade 

Suståne Natural Fertilizer is backed by over 30 years of independent applied research on diverse crops and ecosystems. Unmatched by any other organic fertilizer manufacturer, such research is the foundation for developing products that deliver value under a wide variety of growing conditions. The superior performance of Suståne products is recognized by growers from around the world.

Benefits of Natural Organic 4•6•4
  • Adds approximately 5% humates by volume, increasing cation exchange and organic matter
  • Increases nutrient and water holding capacity of the soil, strengthening plant tolerance to all abioctic stress
  • Promotes healthy root development
  • Improves buffering against changes in soil pH
  • Increases the soil’s ability to suppress plant pathogens
  • Increases soil aggregate stability, porosity, and quality for greater root development and water holding capacity
Safe for Plants, People and the Environment
  • Manufactured by Suståne in the USA at an EPA permitted facility
  • Pathogen and weed seed free
  • Contains no pharmaceutical waste
  • Allowed for export to over 60 countries world wide.
  • Derived from aerobically composted materials, so it won't attract insects or rodents to the application site
  • Contains compost-based microorganisms to help replenish life in poor soils
  • Fully tested and compliant with the national organic standards and the Food Safety Modernization Act requirements for fresh fruit and vegetable production

While synthetic fertilizers supply plant growth nutrients, they do not supply the organic matter required to maintain quality growth. Using fully composted natural fertilizers increases the levels of beneficial microbial activity, which in turn converts nutrients into plant-available forms.

Suståne has developed research-based grow programs for nursery and greenhouse cultivation. Visit our website or contact us for more information on other Suståne products. 

Soil Preparation
  • Light, High Sandy Soil: 6 lb. per 100 ft2 of bed (30 kg per 100m2)
  • Medium, Clay Loam Soil: 4 lb. per 100 ft2 of bed (20 kg per 100m2)
    Heavy, Silty, Clay Loam: 2 lb. per 100 ft2 of bed (10 kg per 100m2)

Low Rate: Recommended for use on salt sensitive species; when concurrent with liquid feed; with production systems utilizing low leaching fractions (less than 10%); and when applied to heavy potting substrates (total porosity less than 65%). 
Medium Rate: Recommended for use on medium feeding species; on most nursery stock and foliage plants; and when liquid feed is not performed concurrently.

High Rate: Recommended for use on heavy feeding species; with production systems utilizing high leaching fractions (greater than 20%); and when applied to light, porous substrates (total porosity greater than 80%).

**NOTE: Adjust fertilizer program for local conditions and requirements.

Item # 
Suståne 4-6-4
Package Size Units / Pallets
(1.4 .mm - 0.6 mm) 
50 lb. bags
1-ton tote 
22.7 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet 
(2.8 mm - 1.4 mm) 
30-20-1175 (international) 
50 lb. bags
1-ton tote 
22.7 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet
4-6-4 Bulk Density

4 6 4 Agriculture Bulk Density


Total Nitrogen (N)
  0.4% Ammoniacal Nitrogen
  0.4% Other Water Soluble Nitrogen
  3.2% Water Insoluble Nitrogen*
Available Phosphate (P(2O5) 6%
Soluble Potash (K2O) 4%
Calcium (Ca) 4%
Magnesium (Mg) 0.75%
Sulfur (S) 1%
Iron (Fe) 0.25%

Derived from aerobically composted turkey litter, feather meal, bone meal, and sulfate of potash.
*3.2% slowly available nitrogen from aerobically composted turkey litter and feather meal.