🌟 Have you seen our 2024-2025 Product Catalogue? Check it out right here! 🌟

Shipping calculated at checkout.

Leave a Review or Share Our Products Online for a Chance to Receive Exclusive Discounts and Coupon Codes.

Holland Secret Grow - Product Information

Part of a trusted line since 1996, Holland Secret Grow is key during your plants' vegetative phase. This formula specifically targets leaf and stem development, ensuring lush, vibrant growth. It's a straightforward solution for gardeners looking to give their plants exactly what they need, when they need it.

Use it alongside Holland Secret Micro, and as your plants prepare to flower, transition to Holland Secret Bloom. This long-standing system has been nurturing plants to their fullest potential for over 30 years.

Mark on Jan 18, 2022

Won a sample and loved it!

Never heard of this before but I won it in my grow group last November and been a customer since. Works great but I wish they had a bigger three pack cuz I'm buying the 5 gallons. Still, loving it.

Directions for Use

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

  • 💧 Shake Well: Ensure Holland Secret Grow 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 1.5 770
10 ml 2 tsp
Late Vegetative 2.3 1170
15 ml 3 tsp
Early Flower 1.6 800
5 ml 1 tsp
Late Flower 2.2 1080
2.5 ml ½ tsp

Minimum Guaranteed Analysis







Derived from: The nutrients in Holland Secret Grow are derived from a range of high-quality sources including potassium phosphate monobasic, magnesium sulfate, potassium nitrate, and ammonium sulfate.


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.