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Holland Secret Micro - Product Information

Since 1996, gardeners have trusted Holland Secret Micro as the go-to start for their plants' nutrition. It's a vital part of the Holland Secret 3-part nutrient system, providing all the essential micronutrients your plants need from seedling to maturity. It's simple and effective, ensuring your plants grow strong and healthy.

Combine it with Holland Secret Grow during the leafy stage, and switch to Holland Secret Bloom for those flowering moments. This trio has been the secret behind thriving gardens for decades.

Jen on Dec 29, 2023

Clean Lines!

No salt buildup, and lines look clear. Third run using Future Harvest and haven't had any issues with deliveries and the bottles always arrive in good condition. New caps are a nice upgrade. Wasn't sure what the little white bag was in the box but then I realized it was a heat pack lol, so it's good if you grow in the winter.

Directions for Use

For vigorous growth and optimal results, adhere to these guidelines:

  • 💧 Shake Well: Ensure Holland Secret Micro is well mixed before measuring.
  • 💧 Order of Mixing: Begin by adding Micro to your water, stirring thoroughly before adding Grow and Bloom.
  • 💧 Gradual Combination: Introduce each nutrient one at a time, mixing well to prevent nutrient lock-out.
  • 💧 Frequency of Application: Apply the nutrient solution twice per week, adjusting based on plant response and growth stage.
  • 💧 Maintenance: Maintain clean equipment to ensure optimal nutrient uptake.
  • 💧 Complete Nutrition: Use Grow, Micro, and Bloom in tandem for a comprehensive feeding regimen throughout your plant's lifecycle.

Dilution Rates

Dilution rates are intended as a guideline and should be modified based on individual plant needs, growth phase, and environmental conditions.

Growth Stage Target EC Target PPM Metric (per 4 liters) Imperial (per gallon)
Seedlings & Cuttings 0.3 170 1.2 ml ¼ tsp
Early Vegetative 1.3 770
5 ml
1 tsp
Late Vegetative 2.3 1170
7.5 ml 1½ tsp
Early Flower 1.6 800 5 ml 1 tsp
Late Flower 2.2 1080 7.5 ml
1½ tsp

Minimum Guaranteed Analysis







Derived from: The nutrients in Holland Secret Micro are derived from a range of high-quality sources including calcium ammonium nitrate, potassium nitrate, ammonium nitrate, borax, sodium molybdate, iron EDTA, iron DPTA, copper EDTA, Manganese EDTA, and zinc EDTA.


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.

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.