Humboldt Nutrients 3-Part Grow formula was designed to be used in conjunction with the Micro and Bloom. Humboldt Nutrients 3-Part is a complete essential nutrient system for hydroponics as well as other growing mediums.


Retail Prices

  • 16 oz. – $6.86
  • 32 oz. – $12.16
  • 1 gal. – $31.04
  • 2.5 gal. – $68.14
  • 5 gal. – $121.68
  • 15 gal. – $346.78

Guaranteed Analysis

Total Nitrogen (N)…………….2.00%
0.20% Ammoniacal Nitrogen
1.80% Nitrate Nitrogen
Available Phosphate (P2O5)……..1.00%
Soluble Potash (K2O)…………..6.00%
Magnesium (Mg)………………..0.50%
0.50% Water Soluble Magnesium

DERIVED FROM: Ammonium Nitrate, Magnesium Nitrate, Potassium Nitrate, Magnesium Phosphate, Potassium Phosphate, Potassium Carbonate, Potassium Sulfate, Magnesium Carbonate, and Magnesium Sulfate.


Fill your reservoir with clean water before administering any nutrient or additive. Make sure that the water level in your reservoir is sufficient to effectively flood your desired area or table. Potential nutrient lock-up can be avoided by adding the Micro before the Bloom and Grow.

Always wash your measuring cup immediately after adding and stirring in each nutrient. Never mix any of these nutrients together in their concentrated form. After adding and stirring in each nutrient, check and adjust the pH to between 5.0 and 6.5.

Always check a small sample of water, not the whole reservoir. Not all meters will read identically, Humboldt Nutrients tests are conducted with a Hanna HI9813-0 meter. Keep the water temperature in your reservoir between 66 and 75 °F. Drain your reservoir and pumps at least once a week to prevent any salt build-up. Please avoid storing in direct sunlight and protect from freezing.

Mixing Instructions: Concentrated

GROW                  MICRO                  BLOOM

1ML/L                   1ML/L                   1ML/L

Vegetative Stage (Week 1-2)
2ML/L                   2ML/L                   1ML/L

Flowering (Early/Transition stage Week 1-3)
1.5ML/L                1.75ML/L             3ML/L

Full Bloom (Fruiting stage Week 4-8)
1ML/L                   2ML/L                   3.5ML/L

Flush Stage (5-10 days)
NONE                    0.5ML/L                1ML/L

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