---
product_id: 164619758
title: "Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 1 Gallon"
brand: "humboldts secret"
price: "€ 179.43"
currency: EUR
in_stock: true
reviews_count: 8
category: "Humboldts Secret"
url: https://www.desertcart.nl/products/164619758-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks
store_origin: NL
region: Netherlands
---

# Potassium silicate additive for plant strength Compatible with soil, coco & hydroponics Thicker stalks & stronger branches Tree Trunk | Potassium Silicate Additive | Liquid Fertilizer for Thicker Stalks, Stress Resistance & Branch Development | Indoor & Outdoor Plant Food, Hydroponic Nutrients, 1 Gallon

**Brand:** humboldts secret
**Price:** € 179.43
**Availability:** ✅ In Stock

## Summary

> 🌱 Grow Strong, Stand Tall — The Secret to Unshakable 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, 1 Gallon by humboldts secret
- **How much does it cost?** € 179.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/164619758-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

- • **Simple, Effective Application:** Just 2.5–5 mL per gallon with every watering keeps your plants thriving through every growth stage.
- • **Support Heavy Blooms & Fruits:** Enhances nutrient uptake and branch development to carry larger, denser flowers and fruits effortlessly.
- • **Boost Growth Across All Mediums:** Optimized for soil, coco, and hydroponic systems to maximize plant resilience and yield potential.
- • **Fortify Your Plants from the Core:** Premium silicate formula thickens stalks and strengthens branches for unbeatable plant stability.
- • **Trusted by Thousands of Gardeners:** Made in the USA with consistent, reliable results that elevate your garden’s performance season after season.

## Overview

Humboldts Secret Tree Trunk is a premium potassium silicate liquid fertilizer designed to strengthen plant cell walls, resulting in thicker stalks, stronger branches, and improved stress resistance. Suitable for indoor and outdoor use, it supports plants grown in soil, coco, or hydroponic systems. Trusted by thousands of gardeners, this 1-gallon additive enhances nutrient uptake and promotes vigorous growth, helping maximize yields and plant health throughout all growth stages.

## 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, 1 Gallon : 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: Healthy plants start from the stalk up. - Great Stuff and strong plants.

## 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 | B07523V87L |
| Best Sellers Rank | #36,338 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #962 in Garden Fertilizers |
| Brand | Humboldts Secret |
| Brand Name | Humboldts Secret |
| Coverage | Medium |
| Customer Reviews | 4.6 out of 5 stars 858 Reviews |
| Global Trade Identification Number | 00706199757151 |
| Item Form | Liquid |
| Item Weight | 128 Ounces |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Humboldts Secret |
| Mixing Ratio | 2.5-5 mL per gallon |
| Model Number | 706199757144 |
| Number of Items | 1 |
| Specific Uses For Product | Hydroponic,Plant Food |
| Target Species | plants |
| UPC | 706199757151 |
| Unit Count | 128 Fluid Ounces |

## Product Details

- **Brand:** Humboldts Secret
- **Item Form:** Liquid
- **Item Weight:** 128 Ounces
- **Liquid Volume:** 128 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, 1 Gallon - Image 1](https://m.media-amazon.com/images/I/71GUHIVJdCL.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.

### ⭐⭐⭐⭐⭐ Healthy plants start from the stalk up.
*by R***T on April 16, 2026*

Great Stuff and strong plants.

### ⭐⭐⭐⭐⭐ Recommended to everyone I know growing
*by C***W on 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

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**Shop now:** [https://www.desertcart.nl/products/164619758-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks](https://www.desertcart.nl/products/164619758-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-06-24*