--- product_id: 72732290 title: "Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 32 Ounce" brand: "humboldts secret" price: "£35.93" currency: GBP in_stock: true reviews_count: 8 category: "Humboldts Secret" url: https://www.desertcart.co.uk/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks store_origin: GB region: United Kingdom --- # 32 oz premium liquid works in soil, coco & hydro fortifies stalks + branches Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 32 Ounce **Brand:** humboldts secret **Price:** £35.93 **Availability:** ✅ In Stock ## Summary > 🌱 Grow like a pro—stronger stalks, unstoppable plants! ## Quick Answers - **What is this?** Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 32 Ounce by humboldts secret - **How much does it cost?** £35.93 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks) ## 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 - • **Universal Growth Booster:** Compatible with soil, coco, and hydroponics—perfect for any indoor or outdoor garden setup. - • **Stress Resistance Amplified:** Enhances plant resilience to environmental stress, ensuring healthier, longer-lasting growth. - • **Stronger Stalks, Bigger Yields:** Potassium silicate boosts cell walls for thick, resilient stems that support heavy flowers and fruits. - • **Easy Application, Maximum Impact:** Just 2.5–5 ml per gallon with watering keeps plants robust throughout all growth stages. - • **Trusted by Thousands of Gardeners:** Made in the USA with premium ingredients, delivering consistent, reliable results every season. ## 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 soil, coco, and hydroponic systems, it supports vigorous growth and higher yields for both indoor and outdoor plants. ## Description desertcart.com : Humboldts Secret Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 32 Ounce : Patio, Lawn & Garden Review: Just look for yourself - This stuff does exactly what it says it will. It really was a game changer for me. Never seen my plants so healthy and thriving through out the whole grow. Made stocks and stems super hard and strong and even made the leaves strong no BS and cheaper than most others I have bought. Review: Helps get thicker stems. - Works great for my indoor garden. ## 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 | |---------------|-------| | ASIN | B0751K43Q2 | | Best Sellers Rank | #37,989 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,130 in Garden Fertilizers | | Brand Name | Humboldts Secret | | Coverage | Medium | | Customer Reviews | 4.6 4.6 out of 5 stars (853) | | Global Trade Identification Number | 00706199757144 | | Item Form | Liquid | | Item Weight | 32 Ounces | | Liquid Volume | 32 Fluid Ounces | | Manufacturer | Humboldts Secret | | Mixing Ratio | 1:2.5ml | | Model Number | Secret Tree | | Specific Uses For Product | Hydroponic,Plant Food | | Target Species | plants | | UPC | 706199757144 | | Unit Count | 32.0 Ounce | ## 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 ![Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 32 Ounce - Image 1](https://m.media-amazon.com/images/I/71+bJRE-gGL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Just look for yourself *by J***N on April 26, 2025* This stuff does exactly what it says it will. It really was a game changer for me. Never seen my plants so healthy and thriving through out the whole grow. Made stocks and stems super hard and strong and even made the leaves strong no BS and cheaper than most others I have bought. ### ⭐⭐⭐⭐⭐ Helps get thicker stems. *by A***Y on December 12, 2025* Works great for my indoor garden. ### ⭐⭐⭐⭐⭐ Great to use for healthy plants *by N***K on January 21, 2026* Use this in conjunction with other Humboldt products in growing plants. Highly recommend . ## 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.co.uk/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks](https://www.desertcart.co.uk/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-19*