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Royal Black - Product Information

Royal Black, OMRI Listed for organic use, enriches plants with humic acid, crucial for nutrient absorption. Its natural chelating agents transport essential minerals, enhancing growth and root development across all stages.

Ideal for pre-treatment, especially in coco mediums, Royal Black integrates seamlessly with any fertilizer regimen, promoting vigorous plant vitality and efficient nutrient utilization.

Tess on Jan 18, 2022

Works Great!

Been using Harvest for a few years, and made the switch from Gold when we switched to a coco grow. Love it, use it all the time

Directions for Use

For optimal results, follow these guidelines when using Royal Black:

  • 💧 Dilution Rate: Use 1.25 ml (cc) per liter (3/4 tsp per gallon) or 25 ml per 20 liters (1 fl. oz. per 5 gallons) of nutrient solution.
  • 💧 Shake Well: Shake well before using.
  • 💧 Compatibility: Works well with most quality brand fertilizers. For optimal results, use the complete line of Future Harvest Nutrients.

Growth Stage:

Use during all stages: rooting, transplanting, vegetative, and flowering.

For Use In:

Soil and coco systems.


Apply every feeding.

Key Features

  • ✔️ Strengthens plant cells and tissues for increased resistance to stress.
  • ✔️ Increases flower and fruit sets.
  • ✔️ Increases Chlorophyll production.
  • ✔️ 100% soluble for rapid treatment of Calcium and Magnesium deficiencies.
  • ✔️ An OMRI listed product for use in organic growing with the power of a synthetic fertilizer.

Minimum Guaranteed Analysis








Compliance and Certifications

For those interested in the regulatory compliance and detailed composition of our product, we transparently provide all pertinent information. To verify our adherence to the rigorous standards set by the Oregon Department of Agriculture, please visit our certification page.

Furthermore, detailed information regarding the contents and levels of metals in Future Harvest products can be reviewed at the Association of American Plant Food Control Officials (AAPFCO) website.

Canadian customers can access our product’s compliance details with the Canadian Food Inspection Agency's regulations at their fertilizer database.

Royal Black is proudly OMRI listed. Visit the OMRI listing to learn more about our dedication to sustainable and organic agriculture.

Future Harvest Nutrient Calculator

By entering your specific grow details, our Nutrient Calculator will outline the total amounts of Future Harvest products needed to take your plants from seeding to harvest, ensuring you're fully prepared for every stage of growth.