--- product_id: 647576231 title: "Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters" brand: "greenleaf nutrients" price: "315.89 DT" currency: TND in_stock: true reviews_count: 5 category: "Greenleaf Nutrients" url: https://www.desertcart.tn/products/647576231-seaweed-and-kelp-fertilizer-for-plants-organic-sea-k-concentrated store_origin: TN region: Tunisia --- # 18%+ soluble potassium for vibrant growth 3500L yield from 1kg powder 100% water soluble, fits all grow systems Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters **Brand:** greenleaf nutrients **Price:** 315.89 DT **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your garden game with nature’s most potent seaweed secret! ## Quick Answers - **What is this?** Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters by greenleaf nutrients - **How much does it cost?** 315.89 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/647576231-seaweed-and-kelp-fertilizer-for-plants-organic-sea-k-concentrated) ## 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 - • **Certified Organic Excellence:** Dual OMRI & EU ECOCERT organic certifications ensure premium, eco-friendly plant nutrition. - • **Ultra-Concentrated Powerhouse:** 1kg makes up to 3500 liters of nutrient-rich solution—maximize your garden’s potential without bulk. - • **Bioactive Boost for Resilience:** Rich in 70+ vitamins, minerals, enzymes, and growth hormones to enhance stress resistance and root vitality. - • **Potassium-Packed for Peak Vibrancy:** Over 18% soluble potassium fuels fruit expansion, flower potency, and lush plant coloring. - • **Versatile & Effortless Application:** 100% water-soluble powder works seamlessly with hydroponics, soil, coco, peat, and drip irrigation. ## Overview Sea-K is a premium, organic seaweed and kelp extract powder delivering a concentrated nutrient solution that yields up to 3500 liters. Extracted via advanced low-temperature enzymatic hydrolysis, it preserves over 70 bioactive compounds including high potassium (18%+), magnesium, and calcium. Fully water-soluble and OMRI/EU ECOCERT certified, it supports all growing systems—hydroponics, soil, coco, and more—promoting stronger growth, enhanced fruiting, and improved soil vitality. ## Description Product 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! Directions Dissolve the powder in water and apply to plants or soil according to the growing system used. Safety Warning Handle with care. Avoid contact with skin and eyes. Keep out of reach of children and pets. Do not ingest. Use in a well-ventilated area. Follow local regulations for disposal of unused product. Review: A Very Effective Biostimulant - I grow Atlantic Giant pumpkins competitively and had my most successful season last year by using this product extensively. I use it as both a foliar feed and as a root drench. I found it to be an effective biostimulant that made the plants greener and grow more vigorously. Additionally, the high percentage of potassium contributed to enhanced fruit growth. This product will be a staple of my gardening program going forward. 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! ## 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. 1kg ultra concentrated bag size makes up to 2000 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 | B083LLVZQM | | Best Sellers Rank | 139,760 in Garden ( See Top 100 in Garden ) 798 in Multi-Purpose Fertilisers | | Brand | Greenleaf Nutrients | | Brand Name | Greenleaf Nutrients | | Country of Origin | USA | | Coverage | Various plants and growing systems | | Customer Reviews | 4.5 out of 5 stars 103 Reviews | | Item Form | Powder | | Item Weight | 1000 Grams | | Item form | Powder | | Item weight | 1000 Grams | | Manufacturer | Greenleaf Nutrients | | Mixing Ratio | 1 gram per 2 gallons | | Model Number | Sea-K-1000g-FBA | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | Sea-K Kelp Extract 1kg | | Specific Uses For Product | Various plants and growing systems | | Specific uses for product | Various plants and growing systems | | Target Species | plants | | Unit Count | 1000.0 gram | ## Product Details - **Brand:** Greenleaf Nutrients - **Item Form:** Powder - **Item Weight:** 1000 g - **Manufacturer:** Greenleaf Nutrients - **Specific Uses For Product:** Garden cultivation and farming ## Images ![Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters - Image 1](https://m.media-amazon.com/images/I/816PcE7s2gL.jpg) ![Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters - Image 2](https://m.media-amazon.com/images/I/612M8v+LZPL.jpg) ![Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters - Image 3](https://m.media-amazon.com/images/I/51UyiK273+L.jpg) ![Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters - Image 4](https://m.media-amazon.com/images/I/41UXktb+amL.jpg) ![Seaweed and Kelp Fertilizer for Plants - Organic Sea-K - Concentrated Extract Powder Nutrient Makes 3500 Liters - Image 5](https://m.media-amazon.com/images/I/81v14Mjh5tL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Very Effective Biostimulant *by T***S on 21 May 2025* I grow Atlantic Giant pumpkins competitively and had my most successful season last year by using this product extensively. I use it as both a foliar feed and as a root drench. I found it to be an effective biostimulant that made the plants greener and grow more vigorously. Additionally, the high percentage of potassium contributed to enhanced fruit growth. This product will be a staple of my gardening program going forward. ### ⭐⭐⭐⭐⭐ Worm Castings tell me it WORKS! *by M***Z on 5 February 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! ### ⭐⭐⭐⭐ Very hydrophilic *by R***S on 16 October 2025* Having experience in the past with soluble kelp extracts, I know they are hydrophilic and will turn into a sticky rock, so I am not trusting the resealable plastic bags. I immediately transferred the powder into airtight glass jars. A very fine powder that dissolves in water quickly. Hoping for great results using it. --- ## 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.tn/products/647576231-seaweed-and-kelp-fertilizer-for-plants-organic-sea-k-concentrated](https://www.desertcart.tn/products/647576231-seaweed-and-kelp-fertilizer-for-plants-organic-sea-k-concentrated) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-04*