--- product_id: 67861012 title: "Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb | Part 1 of a 2-Step System, Targeted Micronutrient Package, Boosts Leaf Growth and Promotes Strong Roots" brand: "jack's classic" price: "41394 kr" currency: ISK in_stock: true category: "Jack's Classic" url: https://www.desertcart.is/products/67861012-jacks-nutrients-5-12-26-hydroponic-professional-fertilizer-part-25lb store_origin: IS region: Iceland --- # Micronutrient-enriched for optimal growth Water-soluble powder for easy mixing 5-12-26 precise nutrient ratio Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb | Part 1 of a 2-Step System, Targeted Micronutrient Package, Boosts Leaf Growth and Promotes Strong Roots **Brand:** jack's classic **Price:** 41394 kr **Availability:** ✅ In Stock ## Summary > 🌿 Feed your future: professional-grade nutrients for unstoppable growth! ## Quick Answers - **What is this?** Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb | Part 1 of a 2-Step System, Targeted Micronutrient Package, Boosts Leaf Growth and Promotes Strong Roots by jack's classic - **How much does it cost?** 41394 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/67861012-jacks-nutrients-5-12-26-hydroponic-professional-fertilizer-part-25lb) ## Best For - jack's classic enthusiasts ## Why This Product - Trusted jack's classic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Hydroponic-Ready:** Designed specifically for continuous liquid feed systems with clear mixing ratios. - • **Trusted Pro Choice:** Top-rated by growers with 4.8 stars and proven performance in controlled environments. - • **Ultra-Efficient Powder:** Concentrated water-soluble powder stretches your feed budget further. - • **All-in-One Micronutrients:** Built-in micronutrients eliminate extra feeding steps for hassle-free growth. - • **Precision Nutrient Balance:** Tailored 5-12-26 formula fuels robust leaf and root development. ## Overview Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A is a 25lb water-soluble powder designed for hydroponic systems. It delivers a precise balance of macro and micronutrients to promote vigorous leaf and root growth without the need for additional feeding. Trusted by professionals, it includes clear mixing instructions for continuous liquid feeding, making it ideal for greenhouse and controlled environment crops. ## Description desertcart.com : Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb | Part 1 of a 2-Step System, Targeted Micronutrient Package, Boosts Leaf Growth and Promotes Strong Roots : Patio, Lawn & Garden ## Features - 5-12-26 Analysis - Supplies a specific balance of macro, secondary, and micronutrients for many different growing environments and crop types. - Water-Soluble Powder – Powdered concentrates go further than liquid fertilizers. Simply mix your measured powder with water and you are ready to feed with multiple gallons of liquid fertilizer! - Mixing Rate – Proper mixing ratios are supplied on the bag for optimal feeding. - Micronutrients - Added micronutrients supply your plant with the nutrition it needs for optimal growth and health. Unlike other fertilizers, additional feeding is not required. - Continuous Liquid Feed Program – Intended for use with hydroponic systems. Mixing instructions by volume included. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07CWXTJ6X | | Best Sellers Rank | #88,732 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,796 in Garden Fertilizers | | Brand Name | Jack's Classic | | Coverage | Full | | Customer Reviews | 4.8 4.8 out of 5 stars (390) | | Item Form | Powder | | Item Type Name | Fertilizer | | Item Weight | 25 pounds | | Liquid Volume | 500 ml | | Manufacturer | JR Peters | | Model Number | 79030 | | Number of Items | 1 | | Part Number | 79030 | | Specific Uses For Product | Hydroponic | | Target Species | Greenhouse and Controlled Environment crops | | UPC | 671341790303 | | Unit Count | 400 Ounce | ## Product Details - **Brand:** Jack's Classic - **Item Form:** Powder - **Item Weight:** 25 pounds - **Liquid Volume:** 500 ml - **Specific Uses For Product:** Hydroponic ## Images ![Jack's Nutrients 5-12-26 Hydroponic Professional Fertilizer Part A, 25lb | Part 1 of a 2-Step System, Targeted Micronutrient Package, Boosts Leaf Growth and Promotes Strong Roots - Image 1](https://m.media-amazon.com/images/I/71tIae-eNvL.jpg) ## Questions & Answers **Q: Is this product water soluable** A: Yes it is. It is very soluable. I reccomended running it at these ragione. Part A : 3g/gallon Part B : 2g/ gallon Epsom Salt: 1g/gallon And if you are using RO water, add 5ml/gallon Calimagic to this mix. It works fangastic. **Q: Are they organic?** A: No **Q: Do I need to add something to this if I am growing tomatoes (kratky method of hydroponics)?** A: Yes, calcium nitrate must be dissolved separately. It is also called Jack's part B, or 15-0-0 (Ca-19%), use a greenhouse brand like jacks, Powergrow, or Yara. I have found the super cheap brands (eg southernAG, highYield) may be coated with insoluble goop, or otherwise contaminated. The two parts must be diluted before mixing or the calcium and sulfur will form gypsum and gypsum is only mildly soluble so can settle out of a concentrate and is then very hard to redissolve. **Q: can it be used in soil? If so at what rate?** A: Absolutely...same rate as hydro is fine. If your using it for canna I increase slowly and like keeping it under 1000ppm cus I use dry amendments as well. Jack's also has a line of boosters ## Frequently Bought Together - Jack's Classic Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Jack's Classic Nutrients 15-0-0 Part B Water-Soluble Fertilizer for Calcium Uptake and Strong Leaf Growth in Continuous Liquid Feed Programs, 25Lbs --- ## 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.is/products/67861012-jacks-nutrients-5-12-26-hydroponic-professional-fertilizer-part-25lb](https://www.desertcart.is/products/67861012-jacks-nutrients-5-12-26-hydroponic-professional-fertilizer-part-25lb) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-08-30*