--- product_id: 67861012 title: "Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs" brand: "jack's classic" price: "€ 287.15" currency: EUR in_stock: true reviews_count: 8 category: "Jack's Classic" url: https://www.desertcart.hr/products/67861012-nutrients-hydroponic-5-12-26-professional-fertilizer-part-a-25 store_origin: HR region: Croatia --- # Micronutrients included for optimal growth Water-soluble powder for max mix efficiency 5-12-26 precise nutrient ratio Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs **Brand:** jack's classic **Price:** € 287.15 **Availability:** ✅ In Stock ## Summary > 🌿 Feed like a pro, grow like a legend! ## Quick Answers - **What is this?** Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs by jack's classic - **How much does it cost?** € 287.15 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/67861012-nutrients-hydroponic-5-12-26-professional-fertilizer-part-a-25) ## 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 Mix:** Clear, easy-to-follow mixing ratios ensure flawless integration into any hydroponic system. - • **Precision Nutrient Balance:** Tailored 5-12-26 formula fuels every growth stage with perfect macro and micronutrient synergy. - • **Pro-Level Continuous Feeding:** Designed for continuous liquid feed programs, empowering you to maintain peak plant performance effortlessly. - • **All-In-One Micronutrient Boost:** No extra supplements needed—complete nutrition supports vigorous, healthy plants from seedling to harvest. - • **Ultra-Efficient Water Solubility:** Powdered concentrate dissolves instantly, stretching your investment across gallons of potent feed. ## Overview Jack's Classic Nutrients Hydroponic 5-12-26 Part A is a 25 lb water-soluble powder fertilizer expertly formulated for hydroponic systems. It delivers a precise balance of macro and micronutrients, ensuring robust plant growth without the need for additional supplements. Trusted by hobbyists and professionals alike, this concentrate offers easy mixing instructions and supports continuous liquid feeding programs for optimal crop performance. ## Description Jack's Fertilizers has been a trusted innovator in water-soluble fertilizers for over 75 years. Founded in 1947 and still family-led today, we combine scientific expertise with a legacy of quality to serve growers worldwide. With our Jack’s Classic, Jack's Nutrients, Jack’s Professional, and Jack's Elementals lines, we continue to design, formulate, and manufacture premium plant nutrition solutions in the USA. Jack's Fertilizers has been a trusted innovator in water-soluble fertilizers for over 75 years. Founded in 1947 and still family-led today, we combine scientific expertise with a legacy of quality to serve growers worldwide. With our Jack’s Classic, Jack's Nutrients, Jack’s Professional, and Jack's Elementals lines, we continue to design, formulate, and manufacture premium plant nutrition solutions in the USA. Jack’s Classic is professional-grade fertilizer designed for home gardeners who want proven results. Made with the same high-quality ingredients used by professionals, it provides essential nutrients plants need to grow strong and healthy. Perfect for flowers, fruits, vegetables, and houseplants, each formula includes clear mixing instructions and feeding schedules to help gardeners nourish everything from a single plant to a backyard garden. Jack’s Classic is professional-grade fertilizer designed for home gardeners who want proven results. Made with the same high-quality ingredients used by professionals, it provides essential nutrients plants need to grow strong and healthy. Perfect for flowers, fruits, vegetables, and houseplants, each formula includes clear mixing instructions and feeding schedules to help gardeners nourish everything from a single plant to a backyard garden. Soluble. Available. Consistent. Since 1947, these qualities define our fertilizers. Now Jack’s introduces small batch blends with Jack’s Nutrients, a collection of formulas designed for many controlled growing environments . No hype, confusing names, or flashy labels, just real fertilizer built on proven science to deliver reliable nutrition and consistent results for growers. Soluble. Available. Consistent. Since 1947, these qualities define our fertilizers. Now Jack’s introduces small batch blends with Jack’s Nutrients, a collection of formulas designed for many controlled growing environments . No hype, confusing names, or flashy labels, just real fertilizer built on proven science to deliver reliable nutrition and consistent results for growers. Jack's Fertilizer offers professional greenhouse growers high-quality water-soluble fertilizer blends designed to efficiently deliver nutrients across many crops and growing environments . Jack’s Pro includes 60 proven formulas developed through years of lab and commercial testing to solve real grower challenges. Each concentrated powder forms a true solution for reliable nutrient availability and vigorous plant growth. Jack's Fertilizer offers professional greenhouse growers high-quality water-soluble fertilizer blends designed to efficiently deliver nutrients across many crops and growing environments . Jack’s Pro includes 60 proven formulas developed through years of lab and commercial testing to solve real grower challenges. Each concentrated powder forms a true solution for reliable nutrient availability and vigorous plant growth. The Jack’s Elementals line includes specialty elements and blends that allow you to hone in on specific nutrients in your growing operations . These products are designed for use by professionals that are looking to dial in efficiencies with extreme precision. The Jack’s Elementals line includes specialty elements and blends that allow you to hone in on specific nutrients in your growing operations . These products are designed for use by professionals that are looking to dial in efficiencies with extreme precision. Where in the USA is Jack's Fertilizers made? All Jack's Fertilizers products are formulated and manufactured at our headquarters and production facility in Allentown, Pennsylvania, USA. Who can use Jack's Fertilizers? Our fertilizers are used by professional growers, greenhouse operations, research universities, specialty agriculture producers, and home gardeners who want high quality plant nutrition. What makes Jack's Fertilizers different? At Jack's Fertilizers, we are known for our precision formulas, high-purity ingredients, and decades of research, delivering exact nutrients to your plants. Where in the USA is Jack's Fertilizers made? All Jack's Fertilizers products are formulated and manufactured at our headquarters and production facility in Allentown, Pennsylvania, USA. Who can use Jack's Fertilizers? Our fertilizers are used by professional growers, greenhouse operations, research universities, specialty agriculture producers, and home gardeners who want high quality plant nutrition. What makes Jack's Fertilizers different? At Jack's Fertilizers, we are known for our precision formulas, high-purity ingredients, and decades of research, delivering exact nutrients to your plants. More from Jack's Fertilizers Visit the Store More from Jack's Fertilizers Visit the Store Review: Great Value, Great Product - Best nutrients around, and the value is unbeatable. Will outlast dozens of bottles of premixed nutrients at a fraction of the price, with better quality and effectiveness. Don't waste your money on other brands or premixed nutes. These are the real deal when used with Part B. Review: Best fertilizer on the market - I use this for my hydroponic grows, and this is like giving your plants steroids!!! It’s an old school fertilizer, but it has got to be the most effective fertilizer on the market!!! If you follow the instructions, your plants will grow so fast, and produce like nothing you have ever used before!!! There is nothing better simply put!!!! ## 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 | #170,902 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #2,930 in Garden Fertilizers | | Brand | Jack's Classic | | Brand Name | Jack's Classic | | Coverage | Full | | Customer Reviews | 4.8 out of 5 stars 389 Reviews | | Item Form | Powder | | Item Type Name | Fertilizer | | Item Weight | 25 Pounds | | Liquid Volume | 500 Milliliters | | 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 | 400.0 Ounce | ## Product Details - **Brand:** Jack's Classic - **Item Form:** Powder - **Item Weight:** 25 Pounds - **Liquid Volume:** 500 Milliliters - **Specific Uses For Product:** Hydroponic ## Images ![Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Image 1](https://m.media-amazon.com/images/I/71tIae-eNvL.jpg) ![Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Image 2](https://m.media-amazon.com/images/I/81Ey6gWVpoL.jpg) ![Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Image 3](https://m.media-amazon.com/images/I/81Ide+MxV2L.jpg) ![Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Image 4](https://m.media-amazon.com/images/I/71OM95J8LqL.jpg) ![Nutrients Hydroponic 5-12-26 Professional Fertilizer Part A, 25 lbs - Image 5](https://m.media-amazon.com/images/I/71Nm6dXEbtL.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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Value, Great Product *by S***N on April 12, 2026* Best nutrients around, and the value is unbeatable. Will outlast dozens of bottles of premixed nutrients at a fraction of the price, with better quality and effectiveness. Don't waste your money on other brands or premixed nutes. These are the real deal when used with Part B. ### ⭐⭐⭐⭐⭐ Best fertilizer on the market *by E***E on January 27, 2026* I use this for my hydroponic grows, and this is like giving your plants steroids!!! It’s an old school fertilizer, but it has got to be the most effective fertilizer on the market!!! If you follow the instructions, your plants will grow so fast, and produce like nothing you have ever used before!!! There is nothing better simply put!!!! ### ⭐⭐⭐⭐⭐ Fantastic product *by J***N on March 4, 2026* I love this product and I dont have to keep buying it. The quantity is perfect ## 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.hr/products/67861012-nutrients-hydroponic-5-12-26-professional-fertilizer-part-a-25](https://www.desertcart.hr/products/67861012-nutrients-hydroponic-5-12-26-professional-fertilizer-part-a-25) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-14*