• Suståne for Cannabis

    Suståne natural and organic fertilizers for hemp and medical cannabis.

Natural Base + Coated Controlled Release Fertilizer 120-Day Nutrient Release at 70°F  (21°C)

Suståne® 16•4•8 Natural Base + Controlled Release

Suståne 16-4-8 was developed as a combination fertilizer with a time released 4-1-2 nutrient package blended with a 50% Suståne humus rich, premium natural base. Suståne 16-4-8 is perfect for outdoor and greenhouse cannabis crops that require an extended release of essential nutrients. 

Suståne 16-4-8 Nursery Fertilizer is available in both 180-day and 120-day release profiles to meet the needs of your production cycle. Suståne 16-4-8 Nursery Fertilizer is derived from aerobically composted turkey litter, polymer coated urea, polymer coated MAP, and polymer coated potassium nitrate.

Professional Grade 

Suståne products are derived from biologically stable humus-rich compost and contain both water soluble nitrogen (WSN) and slow release nitrogen (SRN), beneficial microbiology, and all 17 elements essential for plant photosynthesis. With a near-neutral pH, a low salt index and low ammonium nitrogen percentage, Suståne will not cause seedling stress or plant fertilizer “burn”. Suståne products increase soil cation exchange capacity (CEC) by supplying humates and stable organic matter. Suståne’s organic and blended natural fertilizers provide all soil types with additional buffering capacity, allowing for more consistent and productive growth.

Benefits of 16-4-8 120-Day Natural Base + Controlled Release
  • Suståne Natural Base + Controlled Release Fertilizers (CRF)  are the new generation in environmentally friendly plant nutrition with minimal impact on the non-target environment
  • 16-4-8 provides 3-4 month nutrient release in containers
  • Suståne Natural Base + CRF produce predictable results, dependable performance and high quality plants
  • Designed, tested and proven to provide equal or superior growth results compared to similar formulations (4-1-2 ratio) of nursery industry standards
  • Enhances soil-plant nutrient exchange increasing uptake efficiency
  • Low burn potential, nutrients release gradually over time
  • 16-4-8 supplies all primary, secondary and micronutrients required for complete plant photosynthesis

Container Topdressing Application Rates in Grams
Rate5” Std.
(12 cm)
6" Std.
(15 cm)
1 gallon
(3.5 L)
2 gallon
(7.6 L)
3 gallon
(11.3 L)
5 gallon
(19 L)
7 gallon
(26.5 L)
10 gallon
(37.8 L)
15 gallon
(56.8 L)
Low 4 6 9 20 35 55 79 95 102
Med 6 9 14 30 52 83 119 143 153
High 7 13 20 41 73 116 166 201 215
Container Mix & Lanscape Application Rates
      Container Mix Rates by Volume
   lb. per cubic yard    kg per cubic meter
 Low Med High Low Med High
 4 7 9 2.4 4.2 5.3
      Landscape Application Rates by Area
   lb. per 1,000 square feet    kg per 100 square meter
 Low Med High Low Med High
9 17 23 4.4 8.3 11.2

Low Rate: Recommended for 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.

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%).

Item # 
Suståne 16-4-8 120-Day
Package Size Units / Pallets
(2.8 .mm - 1.4 mm) 
50-50-1175 (international)
50 lb. bags
1-ton tote 
22.7 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet 

Suståne has developed research-based grow programs for indoor and outdoor Cannabis cultivation. Visit our website or contact us for more information on other Suståne products for growing medical marijuana and hemp for fiber or CBD. 

16-4-8 Bulk Density
bulkdensity16 4 8 120day

Guaranteed Analysis

Total Nitrogen (N) 16%
    0.5% Ammoniacal Nitrogen*
    2.6% Nitrate Nitrogen*
    1.5% Water Insoluble Nitrogen**
    11.2% Urea Nitrogen*
    0.2% Other Water Soluble Nitrogen
Available Phosphate (P2O5) 4%
Soluble Potash (K2O) 8%
Calcium (Ca) 2.75%
Magnesium (Mg) 0.75%
Sulfur (S) 1.00%
Iron (Fe) 0.25%
Manganese (Mn) 0.05%

Derived from aerobically composted turkey litter, polymer-coated urea, polymer coated potassium nitrate, polymer coated mono-ammonium phosphate, ureaform, hydrolyzed feather meal and sulfate of potash.
*12.7% controlled-release nitrogen derived from polymer-coated urea, polymer coated potassium nitrate and polymer coated mono-ammonium phosphate.
**2.6% slow-release nitrogen derived from aerobically composted turkey litter, ureaform, and hydrolyzed feather meal.