---
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: "€ 79.35"
currency: EUR
in_stock: true
reviews_count: 8
category: "Humboldts Secret"
url: https://www.desertcart.hr/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks
store_origin: HR
region: Croatia
---

# 32 fl 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:** € 79.35
**Availability:** ✅ In Stock

## Summary

> 🌱 Unlock the secret to unstoppable plant power!

## 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?** € 79.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/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

- • **Effortless Application:** Just 2.5–5 ml per gallon with watering keeps your garden thriving without extra hassle.
- • **Universal Compatibility:** Seamlessly integrates with soil, coco, and hydroponic systems for versatile plant nutrition.
- • **Trusted by Pro Gardeners:** Made in the USA with premium ingredients, delivering consistent, reliable results every cycle.
- • **All-Growth-Stage Power Boost:** Enhance resilience and growth from seedling to bloom, indoors or out, in any medium.
- • **Stronger Stalks, Superior Stability:** Fortify your plants with potassium silicate for thicker, unbreakable stems that support heavier yields.

## 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. Compatible with soil, coco, and hydroponic systems, it supports vigorous growth and higher yields for indoor and outdoor plants alike.

## 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: Helps get thicker stems. - Works great for my indoor 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.

## Features

- Plant Strength & Stability: Humboldt 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 | #33,233 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #889 in Garden Fertilizers |
| Brand | Humboldts Secret |
| Date First Available | August 22, 2017 |
| Global Trade Identification Number | 00706199757144 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Weight | 2 pounds |
| Item model number | Secret Tree |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | Humboldts Secret |
| Number of Items | 1 |
| Package Dimensions | 7.36 x 5.12 x 2.32 inches |
| Specific Uses For Product | Hydroponic,Plant Food |
| 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/61BWPmDtbaL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Helps get thicker stems.
*by A***Y on December 12, 2025*

Works great for my indoor garden.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Humboldts Tree Trunk is definitely worth every penny
*by K***. on March 5, 2025*

I definitely recommend Humboldts tree trunk this a awesome additive I added this to my lemon tree regimen & in just 3 days the growth rate increased tremendously this product is a must buy it’s definitely worth the value & the size it’s functionality helps with the uptake of your current nutrients I guarantee you won’t be disappointed

## 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

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**Shop now:** [https://www.desertcart.hr/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks](https://www.desertcart.hr/products/72732290-tree-trunk-potassium-silicate-additive-liquid-fertilizer-for-thicker-stalks)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-01-23*