Our Starter Kit comes with everything you need to begin your growing journey! 

shop now

Flower Stacker

Regular price
Sale price

Making Growing Simple, Exciting, and Easier to Exceed At

Applications of Phosphorus and Potassium during this critical growth phase results in vigorous growth and stimulates early flowering and setting of fruits thereby increasing the number and production of fruits per plant.

Studies have shown yields per plant to be increased upwards of 30%

Product Information

Flower Stacker

ADDED FLOWERING AGENT TO YOUR REGIME: Flowering boosters are particularly important in the hydroponic and agricultural industries. Thousands of growers use Flower Stacker as an additional flowering agent to maximize their yields by harnessing the power of our clean-running formula.

PREMIUM INGREDIENTS: Our Humboldts Secret Flower Stacker is made with quality ingredients to boost and ensure the thriving development of your flowers while enhancing natural flavor, aroma, and other desirable traits. Perfectly suited for potting soil for indoor plants!

CONTAINS VITAMIN B1: Vitamin B1 has been touted as a cure-all for transplant shock. Labels typically claim that B1 aids the rooting and growth of a wide range of plants. Our formula contains enough B1 for your plants and flowers to grow strong and healthy.

HIGH AMOUNT OF PHOSPHORUS AND POTASSIUM: Application of phosphorus and potassium during the flower development phase results in vigorous growth and stimulates early flowering and setting of fruits, thereby increasing the number and production of fruits per plant.

INCREASE YIELDS BY UP TO 30%: Flower Stacker is a flowering additive designed to increase yield and flower density. Our precise formula has been shown to have a noticeable impact on yield outcome by up to 30%. It’s an ideal nutrient solution for potting soil for indoor plants and outdoor plants.Fr

Flower Stacker Feed Chart

Mixing Procedure

1) Fill your reservoir with water.  It may be filtered or tap water.  If you use filtered water you may need to add some CalMag & Iron.

2) Add HUMBOLDTS SECRET NUTRIENTS listed on the feed chart (Shake each bottle a little bit)

3) After you add your nutrients, adjust the PH so that your end mixture in your reservoir is between 5.5 and 6.5 (If needed.)

4) Can be used in Soil, Coco, Deep Water Culture (DWC) and Aeroponics.  Typically less nutrients are used in DWC. If you grow in Hydroponics it is recommended that you use  Golden Tree at a lower dose and use Plant Enzymes. We suggest you play around with the amounts of each nutrient and find out what works best for your setup as there are many variations to growing.

Additional Information

1) In order to have a successful grow growers should use at minimum Base A, Base  B & Golden Tree. 

2) For Veg: Add 1-2ml of Golden Tree per gallon to your reservoir. Then, add your base nutrient until PPM levels of the reservoir mixture reaches between 800-1000 (Hanna Scale)

For Flower: Add 2-5ml of Golden Tree, then add base nutrient into your reservoir  until your PPM levels of the reservoir mixture reaches between 1000-1300 (Hanna Scale, which is 2.0-2.6 in EC.) Remember that this is a rough estimate. Strains and growing mediums vary, some will enjoy higher PPM's and some lower.  Flushing at the end is not necessary.

Shake bottle and measure out 3-8mL per gallon of water.

Dilute Flower Stacker into a full watering can or reservoir and stir to thoroughly mix.

Apply to the root zone, and for optimal results feed with every or every other watering beginning the third week of flower.

We are confident that you will be pleased with your product and offer a 100% satisfaction guarantee.

If you are not satisfied simply return the unused portion to us within 6 months along with your original receipt for a full refund.

Frequently Asked Questions

Absolutely not. No products from Humboldts Secret are made with any harmful or banned PGRs.

Yes, but as Flower Stacker is very concentrated so be careful of plant burn. 1mL raises PPM's by 20.

Phosphate, soluble potash and vitamin B-1.

Flower Stacker is great for any flowering or fruiting plants or trees!

Customer Feedback

Don’t just take our word for it..

Rated by hundreds of happy growers

Grow bigger plants with more yield in less time without struggle

Get the Startaer Kit for only $149.99 $109.99

Each Starter Kit Includes:

  • World's Best Base Nutrient System Grow & Bloom Base A and B (1/4 Gallon of Each)
  • Golden Tree (1/8 Gallon)
  • Flower Stacker (1/4 Gallon)
  • CalMag & Iron (1/4 Gallon)
  • Plant Enzymes (8 Ounces)

Get the latest news and growing information from HSS