--- product_id: 72732290 title: "Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce" brand: "humboldts secret" price: "€ 88.26" currency: EUR in_stock: true reviews_count: 8 url: https://www.desertcart.pt/products/72732290-humboldts-secret-tree-trunk-potassium-silicate-additive-32-ounce store_origin: PT region: Portugal --- # 32 fl oz premium liquid works in soil, coco & hydro fortifies stalks & branches Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce **Brand:** humboldts secret **Price:** € 88.26 **Availability:** ✅ In Stock ## Summary > 🌱 Grow like a pro—stronger plants, bigger harvests, zero compromises! ## Quick Answers - **What is this?** Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce by humboldts secret - **How much does it cost?** € 88.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/72732290-humboldts-secret-tree-trunk-potassium-silicate-additive-32-ounce) ## 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 - • **Stress-Proof Your Plants:** Enhances resistance to environmental stress, keeping your garden thriving. - • **Universal Growth Booster:** Compatible with soil, coco, and hydroponics—one formula for every grow setup. - • **Maximize Branch Development:** Supports nutrient flow and branch strength to carry heavier flowers and fruits. - • **Trusted by Pros & Enthusiasts:** Made in the USA with premium ingredients, backed by 863+ rave reviews. - • **Stronger Stalks, Bigger Yields:** Potassium silicate boosts cell walls for thicker, more resilient plant structure. ## Overview Humboldts Secret Tree Trunk is a 32-ounce potassium silicate liquid fertilizer designed to strengthen plant cell walls, resulting in thicker stalks, enhanced branch development, and improved stress resistance. Suitable for indoor and outdoor use, it works seamlessly in soil, coco, and hydroponic systems to maximize plant health and yield potential throughout all growth stages. ## Description Starter Kit 2 Tree Trunk Base A & B Golden Tree Plant Enzymes Flower Stacker Calmag & Iron Clear directions and consistent quality, no guesswork. Trusted by gardeners for over 10 years. Professional-grade plant nutrition, simple and consistent, from indoor plants to outdoor gardens. Humboldts Secret was created by gardeners, for gardeners, with a simple goal, make high-quality plant nutrients affordable and easy to use, so more people can grow with confidence. Humboldts Secret products are made with carefully selected ingredients and manufactured in our California facility, for consistent quality you can count on. We make plant nutrition simpler, clearer, and easier to follow, so gardeners can spend less time guessing and more time growing. ## Features - Packaging Update: You may receive previous or updated packaging during our transition. Same formula, same performance. Plant Strength & Stability - Humboldts Secret Tree Trunk is a premium silicate additive that fortifies plant cell walls, producing thicker stalks and stronger branches. By supporting heavier flowers and fruit, it enhances stability, improves overall plant health, and helps maximize yield potential in any growing environment. - Enhanced Growth Performance: This silica for plants provides advanced nutrients that improve stem structure and boost resilience. By strengthening natural growth processes, it helps indoor and outdoor plants thrive in soil, coco, or hydroponic systems while delivering vigorous, healthy development across every growth stage. - Thicker Stalks & Better Branching: Tree Trunk liquid fertilizer supports stronger nutrient uptake, encouraging sturdy stalks and abundant branch development. This results in improved architecture, better nutrient flow, and increased capacity to support heavy flowers and fruits through both vegetative and flowering cycles. - Trusted by Gardeners Everywhere: Humboldts Secret Nutrients are made in the USA with premium-quality ingredients trusted by hundreds of thousands of gardeners. Known for delivering consistent, reliable results, this formula strengthens plants, promotes stable yields, and ensures lasting performance in both indoor and outdoor gardens. - Versatile & Easy to Use: Derived from potassium silicate, this liquid silica for plants is compatible with all grow mediums including soil, coco, and hydroponics. Simply apply 2.5–5 ml per gallon (5 ml ≈ 1 teaspoon) with every or every other watering to boost plant strength throughout the entire grow cycle. ## Technical Specifications | Specification | Value | |---------------|-------| | Application Method | Watering | | Asin | B0751K43Q2 | | Best Sellers Rank | #42,619 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #1,050 in Garden Fertilizers | | Brand Name | Humboldts Secret | | Coverage | Medium | | Customer Reviews | 4.6 4.6 out of 5 stars (876) 4.6 out of 5 stars | | Global Trade Identification Number | 00706199757144 | | Item Form | Liquid | | Item Highlight | Liquid Fertilizer, Thicker Stalks, Stress Resistance & Branch Development, Indoor & Outdoor Plants, Soil, Coco & Hydroponics | | Item Weight | 2 pounds | | Liquid Volume | 32 fluid ounces | | Manufacturer | Humboldts Secret | | Mixing Ratio | 1:2.5ml | | Model Number | Secret Tree | | Number Of Items | 1 | | Number Of Packs | 1 | | Specific Uses For Product | Hydroponic,Plant Food | | Target Species | plants | | Unit Count | 32 Ounce | | Upc | 706199757144 | ## Product Details - **Brand:** Humboldts Secret - **Item Form:** Liquid - **Item Weight:** 32 Ounces - **Liquid Volume:** 32 Fluid Ounces - **Specific Uses For Product:** Hydroponic,Plant Food ## Images ![Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce - Image 1](https://m.media-amazon.com/images/I/71+bJRE-gGL.jpg) ![Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce - Image 2](https://m.media-amazon.com/images/I/71eVPI4Ld+L.jpg) ![Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce - Image 3](https://m.media-amazon.com/images/I/81crCMGqP-L.jpg) ![Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce - Image 4](https://m.media-amazon.com/images/I/81eBIxgyTNL.jpg) ![Humboldts Secret Tree Trunk, Potassium Silicate Additive, 32 Ounce - Image 5](https://m.media-amazon.com/images/I/91PwbZxXIML.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well *by on Reviewed in the United States July 24, 2026* Nice nutrients ### ⭐⭐⭐⭐⭐ Grreeat *by on Reviewed in the United States August 13, 2026* Great product, plants growing like weeds since first application. ### ⭐⭐⭐⭐⭐ Recommended to everyone I know growing *by on Reviewed in the United States July 18, 2025* Make sure you shake this before using as it separates a lot, it really helps stiffen plants up so they can support your buds. I’ve never had problems with this burning plants so I use it very early on and it helps get that trunk thick early on. In the late stages you’ll get lots of knuckles too from using this. Don’t need much either ## Frequently Bought Together - Humboldts Secret Tree Trunk - Silicate Additive - Advanced Nutrients - Helps Plants Flourish - Indoor Plant Food - Hydroponic Nutrients - Liquid Fertilizer (32 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 - Humboldts Secret Starter Kit Pack – World's Best Indoor & Outdoor Plant Fertilizer and Nutrient System: Base A & B – Golden Tree – Flower Stacker – Plant Enzymes – CalMag & Iron --- ## 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.pt/products/72732290-humboldts-secret-tree-trunk-potassium-silicate-additive-32-ounce](https://www.desertcart.pt/products/72732290-humboldts-secret-tree-trunk-potassium-silicate-additive-32-ounce) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-04*