---
product_id: 465304416
title: "Organic Sea-K for Plants Seaweed and Kelp Fertilizer Supplement Concentrated Extract Powder Nutrient"
brand: "greenleaf nutrients"
price: "€ 14.58"
currency: EUR
in_stock: true
reviews_count: 13
category: "Greenleaf Nutrients"
url: https://www.desertcart.ie/products/465304416-organic-sea-k-for-plants-seaweed-and-kelp-fertilizer-supplement
store_origin: IE
region: Ireland
---

# 18%+ soluble potassium 70+ vitamins & minerals 100% water soluble powder Organic Sea-K for Plants Seaweed and Kelp Fertilizer Supplement Concentrated Extract Powder Nutrient

**Brand:** greenleaf nutrients
**Price:** € 14.58
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your garden game with nature’s most powerful seaweed elixir!

## Quick Answers

- **What is this?** Organic Sea-K for Plants Seaweed and Kelp Fertilizer Supplement Concentrated Extract Powder Nutrient by greenleaf nutrients
- **How much does it cost?** € 14.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/465304416-organic-sea-k-for-plants-seaweed-and-kelp-fertilizer-supplement)

## Best For

- greenleaf nutrients enthusiasts

## Why This Product

- Trusted greenleaf nutrients brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pure & Potent Organic Power:** OMRI & EU ECOCERT certified for trusted, chemical-free plant nutrition.
- • **Maximized Yield & Resilience:** High potassium and natural growth hormones promote stress resistance and bountiful harvests.
- • **Ultimate Plant Vitality Boost:** Harness 70+ vitamins, minerals & enzymes for unstoppable growth and vibrant blooms.
- • **Advanced Extraction Technology:** Low-temp enzymatic hydrolysis locks in maximum bioactive ingredient purity.
- • **Versatile Growth Compatibility:** 100% water soluble powder perfect for hydroponics, soil, coco, peat & more.

## Overview

Organic Sea-K is a concentrated, 100% water-soluble kelp and seaweed extract powder, packed with over 70 essential vitamins, minerals, and enzymes. Certified organic by OMRI and EU ECOCERT, it uses advanced low-temperature enzymatic hydrolysis to preserve purity and bioactivity. With over 18% soluble potassium and rich in natural growth hormones, it supports robust plant growth, stress resistance, and enhanced yields across all growing media including hydroponics and soil.

## Description

Kelp seaweed extract has long been known as one of the most effective, natural and potent ways to improve your plants. Improve resistance to stress; promote fruit and flower expansion, coloring and potency, and increase Brix! Rich concentrations of more than 70 vitamins, minerals, and enzymes helps benefit your plants and revitalize your soil media. Sea-K Kelp is extracted from species Ascophyllum nodosum, Sargassum, Laginariausing the most advanced, low temperature enzymatic hydrolysis processes, maintaining a light brown color and highest purity of beneficial bioactive ingredients. 100% water soluble powder form suitable for any growthing system or media. Including greenhouse & outdoor drip irrigation, hydroponics, coco, peat, soil, rockwool, etc. High Potassium(K) for vibrancy, with over 18% soluble K! Also high levels of soluble Magnesium (Mg), Calcium (Ca), Iron (Fe), etc. Promotes strong growth, root viability, germination and yields. Rich in polysaccharides, cytokins, auxins, purines, IAA and more! Don’t miss this essential nutrient for your plants! Legal Disclaimer: This product does NOT contain any pesticides, synthetic PGR’s, or and other EPA regulated ingredients. This product is fully compliant with all EPA rules and regulations. This product meets or exceeds all OMRI and state guidelines for heavy metals verified through independent lab testing, and is safe to be used on crops meant for human consumption. This is product is not currently registered, designed or intended for use as fertilizer in the states of Washington, Oregon or California. Please consult your state website (state department of agriculture or fertilizer) for guidance and list of appropriate and registered and approved fertilizers in your region. For questions regarding product pending compliance, or regulatory application process in your state, feel free to contact us!

Review: Worm Castings tell me it WORKS! - I have never seen worm castings in my soil. Been using this every 3 weeks, for 3 about three months and I am seeing worm castings. Alot of people don't like worm castings because they are not pretty, but I love them because it tells me my soil is rich with microbes and worms naturally aerate the soil. This product works very well, super highly concentrated that goes a long way!
Review: Clean,pure,high quality - Green leaf nutes produces high quality products for gardening and cannabis cultivation. Iv used kelp extract in both compost teas and foliar feedings for over 15yrs. This product is the most affordable on the market and is highly concentrated. A little goes a long way. If you value strong, healthy, vigorous plants. Buy this product!!

## Features

- 【Kelp seaweed extract】has long been known as one of the most effective, natural and potent ways to improve your plants. Improve resistance to stress; promote fruit and flower expansion, coloring and potency, and increase Brix! Rich concentrations of more than 70 vitamins, minerals, and enzymes helps benefit your plants and revitalize your soil media.
- 【OMRI and EU ECOCERT Organic】Dual Organic Agriculture certification (National Organic Program) for both USA and Europe for Organic farming and crop production.
- Sea-K Kelp is extracted from species Ascophyllum nodosum, Sargassum, Laginariausing the most advanced, 【low temperature enzymatic hydrolysis processes】, maintaining a light brown color and highest purity of beneficial bioactive ingredients.
- 【100% Water Soluble Powder】 Suitable for any growing system or media, including greenhouse & outdoor drip irrigation, hydroponics, coco, peat, soil, rockwool, etc. 200g ultra concentrated bag size makes up to 400 gallons!
- 【High Potassium(K)】 For vibrancy, with over 18% soluble K! Also high levels of soluble Magnesium (Mg), Calcium (Ca), Iron (Fe), etc.
- 【Promotes strong growth, root viability, germination and yields.】 Rich in polysaccharides, cytokins, auxins, purines, IAA and more! Don’t miss this essential nutrient for your plants!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B096L9TP26 |
| Best Sellers Rank | #61,005 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,603 in Garden Fertilizers |
| Brand | Greenleaf Nutrients |
| Date First Available | August 12, 2022 |
| Item Form | Powder |
| Item Weight | 7.1 ounces |
| Item model number | 742776993208 |
| Manufacturer | Greenleaf Nutrients |
| Number of Items | 1 |
| Product Dimensions | 9 x 6 x 0.5 inches |
| Specific Uses For Product | Hydroponics, Soil, Plant Growth, Root Feeding and Foliar |
| UPC | 742776993208 |
| Unit Count | 7.0548 Ounce |

## Product Details

- **Brand:** Greenleaf Nutrients
- **Item Form:** Powder
- **Item Weight:** 200 Grams
- **Manufacturer:** Greenleaf Nutrients
- **Specific Uses For Product:** Hydroponics, Soil, Plant Growth, Root Feeding and Foliar

## Images

![Organic Sea-K for Plants Seaweed and Kelp Fertilizer Supplement Concentrated Extract Powder Nutrient - Image 1](https://m.media-amazon.com/images/I/91woCrr3R0L.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worm Castings tell me it WORKS!
*by M***Z on February 5, 2026*

I have never seen worm castings in my soil. Been using this every 3 weeks, for 3 about three months and I am seeing worm castings. Alot of people don't like worm castings because they are not pretty, but I love them because it tells me my soil is rich with microbes and worms naturally aerate the soil. This product works very well, super highly concentrated that goes a long way!

### ⭐⭐⭐⭐⭐ Clean,pure,high quality
*by P***. on September 23, 2025*

Green leaf nutes produces high quality products for gardening and cannabis cultivation. Iv used kelp extract in both compost teas and foliar feedings for over 15yrs. This product is the most affordable on the market and is highly concentrated. A little goes a long way. If you value strong, healthy, vigorous plants. Buy this product!!

### ⭐⭐⭐⭐⭐ Fantastic
*by S***J on February 1, 2026*

For whatever reason this prime order was sent out through the post office and they lost it. Amazon immediately refunded the money then I found the product locally in a garden center. It works absolutely fantastic. I grow indoor mini tomatoes and mini sweet peppers over the winter plus a multitude of various house plants the seedlings are some of the strongest I’ve had in a long time and the colors are coming back on my silver dollar jades, and other succulents

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---

*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-20*