Base A

Perfect and Strong balance of Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Fulvic Acid and some other good stuff. Use between 5-14ml/gallon.

Base B

Perfect and Strong balance of Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Fulvic Acid and some other good stuff. Use between 5-14ml/gallon.

Golden Tree

Our signature All-In-One additive. Has all the bells and whistles. Use rate between 1-5ml/gallon.

Flower Stacker

Flowering Booster for use after week 3 of flower. Use rate between 1-8ml/gallon.

Plant Enzymes

Highly concentrated enzymatic formula with a guaranteed content of 7,000 units/ml of active enzyme to help plants grow better and easer. Can be helpful when growing in hydroponics (Coco), Deep Water Culture and Aeroponics. Use rate of no more than 1ml/gallon.

Cal Mag & Iron

Helps correct common deficiencies. May be necessary if using Reverse Osmosis water. Also may be necessary depending on plant genetics. Use rate between 2-5ml/gallon.


Flower Stacker
Flower Stacker
  • Model: Flower Stacker
  • Manufactured by: Humboldts Secret

Price:   Starting at: $30.00

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Flower Stacker is a Flowering Formula that can be used after Week 3 of Flower until the end of your grow. Flower Stacker will assist in the development and maturation of your flowers. Phosphorus (P) and Potassium (K) are critical in the Flowering Phase; resulting in an increase in flowering sites, weight, quality and yields.

Although we consider Golden Tree as an all-in-one additive, many people like to use additional flowering boosting formulas. It is your preference as a grower whether or not to use Flower Stacker.

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How To: Start using Flower Stacker after week 3 of Flower at a rate of 1ml/gallon. Increase gradually each week to a maximum of 8ml/gallon until the end of your grow. Be careful, each ml will raise ppm’s by 20. Flower Stacker is compatible in all grow mediums. Check out our Feed Chart for additional information.


  1. Can I use Flower Stacker with Golden Tree or other additives?
    • Yes, but as Flower Stacker is very concentrated be careful of plant burn. 1ml raises PPM's by 20.
  1. If Golden Tree is an All-In-One additive why do we have additional additives?
    • We firmly believe that all you need to succeed is Base A+B and Golden Tree (if you need CalMag because of your particular setup, then this will still be needed.) Our additional additives are optional, and we provide them as a resource for use at individual growers discretion.
  1. What's in Flower Stacker?
    • Flower Sacker contains Phosphate, Soluble Potash, and Vitamin B-1
  1. What should I use Flower Stacker on?
    • Flower Stacker is great for any plant you want to have bigger better flowers/fruits.
  1. How often should I use Flower Stacker?
    • Flower Stacker can be used between 1-3 times a week depending on the strength and how well your plants are responding.
  1. How do you measure 1ml?
    • A good reference is that 5ml =1tsp, so 1ml is 1/5 of a tsp.
  1. What dose should I use in Soil vs. DWC or Aeroponics.
    • For soil and most mediums you should follow the label directions; between 1-8ml/gallon. In hydroponics setups like DWC and Aeroponics, you should use half dosage.
  1. Does Flower Stacker have any harmful PGRs?
    • Absolutely not. No products from Humboldts Secret are made with any harmful or banned PGRs.
  1. Do you ship internationally?
    • Yes! With international shipments, we will cover the shipping cost of any Golden Tree purchased, so long as it is a 1 gallon minimum. For any other orders, please reach out for a shipping quote.
Click Here for Flower Stacker MSDS

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