--- product_id: 46146203 title: "Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon" brand: "humboldts secret" price: "¥67449" currency: JPY in_stock: true reviews_count: 8 url: https://www.desertcart.jp/products/46146203-flower-stacker-0-7-5-bloom-booster-with-vitamin-b1 store_origin: JP region: Japan --- # High phosphorus & potassium Up to 30% yield boost 2.5 gallons nutrient system Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon **Brand:** humboldts secret **Price:** ¥67449 **Availability:** ✅ In Stock ## Summary > 🌿 Unlock the secret to show-stopping blooms and never settle for average harvests! ## Quick Answers - **What is this?** Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon by humboldts secret - **How much does it cost?** ¥67449 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/46146203-flower-stacker-0-7-5-bloom-booster-with-vitamin-b1) ## Best For - humboldts secret enthusiasts ## Why This Product - Trusted humboldts secret brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Pros:** Clean-running formula favored by thousands of growers for consistent, bigger harvests. - • **Vitamin B1 Power:** Supports transplant recovery and stronger plant establishment. - • **Maximize Your Harvest:** Boost flower density and yields by up to 30% for standout blooms. - • **Premium Nutrient Blend:** Formulated with high phosphorus and potassium to supercharge flower development. - • **Versatile Indoor & Outdoor Use:** Optimized for potting soil across all your growing environments. ## Overview Humboldts Secret Flower Stacker is a 2.5-gallon flowering additive designed to increase flower yield and density by up to 30%. It contains a premium nutrient blend rich in phosphorus, potassium, and Vitamin B1 to support plant growth and transplant recovery. Suitable for both indoor and outdoor potting soil, this formula is trusted by thousands of growers to maximize flowering potential and overall crop performance. ## Description Humboldts SecretFlower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon ## Features - INCREASE YIELDS BY UP TO 30%: Flower Stacker is a flowering additive designed to help your plants natural ability to increase yield and flower density. It’s an ideal nutrient solution for potting soil for indoor plants and outdoor plants. - PREMIUM INGREDIENTS: Our Humboldts Secret Flower Stacker is made with quality ingredients to ensure the development of your flowers. 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 supports conditions for better plant establishment and growth in a wide range of plants. - HIGH AMOUNTS OF PHOSPHORUS AND POTASSIUM: Application of phosphorus and potassium during the flower development phase improves soil/foliar nutrient conditions for better crop yields. - ADDED FLOWERING AGENT TO YOUR REGIME: Flowering boosters are particularly important in 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. ## Product Details - **Brand:** Humboldts Secret - **Item Form:** Liquid - **Coverage:** 30 - **Liquid Volume:** 2.5 Gallons - **Specific Uses For Product:** Hydroponic,Plant Food ## Images ![Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon - Image 1](https://m.media-amazon.com/images/I/61JUsK+UaDL.jpg) ![Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon - Image 2](https://m.media-amazon.com/images/I/714HAnk+aAL.jpg) ![Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon - Image 3](https://m.media-amazon.com/images/I/71O3Pfkb2rL.jpg) ![Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon - Image 4](https://m.media-amazon.com/images/I/71UQtk3X7wL.jpg) ![Flower Stacker | 0-7-5 Bloom Booster with Vitamin B1 | High Phosphorus Potassium Flowering Nutrients | Potting Soil Hydroponics Coco | Indoor & Outdoor Plants | 2.5 Gallon - Image 5](https://m.media-amazon.com/images/I/716RkkE5zkL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Needs sent away it won’t leak *by H***D on April 9, 2025* Good just leaked ### ⭐⭐⭐⭐⭐ Humboldts secret flower stacker is worth every penny *by K***. on March 5, 2025* My lemon tree growth rate increased tremendously when I added Humboldts secret flower stacker to my current nutrients & the health of my lemon tree increased in a matter of days it’s functionality is like no other ### ⭐⭐⭐⭐ Humboldt Sweet and Sticky and Stacker work really well together. *by K***S on January 1, 2021* The media could not be loaded. Daddy like!How is this evening happening? These pictures were taken January 1,2021 and according to my wife are about 11 weeks old. For the last three or four weeks the daytime high temperature has 68°. And at night of about 45° . And the plants seem to love it.Look how tight the bud blossoms are, it’s like one big forearm. I will bring it in soon put it under my grow lights and see how it likes that environment. The temperature is a low of about 65°F, and a high of 75°F. It’s flowing season here with 12 hour days similar to what the bud was getting outdoors.I will use flowers shield Humboldt flower shield to get any pest or mites or anything that might be on it off of it before I bring it inside grow roomAlso in the garden we have passion fruit that is 35’ long by 12’ wide. It took over a clothes line and outdoor clothes away but I put number 10 copper wire honored to support the passion fruit tree. We have a minature orange trees to produces grap fruit sized oranges when it wants to. The lime trees love the sweet and sticky as well. I want to see how good they’re going to taste. Ever fruit tree loves Miracle grow to grow foliage nice and green the fruit as well but that was in the summer. should’ve taken a picture of it I have a lot of little baby lemons and I limes. Once the flowers turn into small fruit the trees get Humboldt stacker. We harvest passion fruit pretty much every few days for a couple of months or longer. I forgot I started with a 4 ounce bottle of the stacker and sweet and sticky by Humboldt. For my cannabis plant growing indoors just a couple of plants. And I realized I started buying the larger bottles because it makes our fruit trees produce really delicious fruit. It might seem like a lot of money at first but the stuff is very concentrated and it goes along way.Our passion fruit already has blossoms were still using miracle grow. I still have Humboldt stacker and sweet and sticky for this year I’ll probably buy some more because it’s worth it it’s very concentrated. ## Frequently Bought Together - Humboldts Secret Flower Stacker – Best Flowering Formula for Bigger Harvests - Flowering Plant Food – Nutrient System for Potting Soil for Indoor & Outdoor Plants - 2.5 Gallons - Humboldts Secret Plant Enzymes – Best Plant and Root Enzymes – 7000 Active Units of Enzyme per Milliliter – Quality Plant Food and Plant Fertilizer – Highly Concentrated – 8 Ounce - Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 32 Ounces --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/46146203-flower-stacker-0-7-5-bloom-booster-with-vitamin-b1](https://www.desertcart.jp/products/46146203-flower-stacker-0-7-5-bloom-booster-with-vitamin-b1) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-06-24*