--- product_id: 42223037 title: "MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit)" brand: "masterblend" price: "£38.56" currency: GBP in_stock: true reviews_count: 8 category: "Master Blend" url: https://www.desertcart.co.uk/products/42223037-masterblend-4-18-38-complete-combo-kit-fertilizer-bulk-2 store_origin: GB region: United Kingdom --- # Professional-grade plant growth boost 100% water soluble formula Precise 1:1:0.5 nutrient ratio MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) **Brand:** masterblend **Price:** £38.56 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your grow game with the pro’s secret weapon! ## Quick Answers - **What is this?** MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) by masterblend - **How much does it cost?** £38.56 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/42223037-masterblend-4-18-38-complete-combo-kit-fertilizer-bulk-2) ## Best For - masterblend enthusiasts ## Why This Product - Trusted masterblend brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Bulk Value & Longevity:** 2.5 lbs kit lasts through multiple 5-gallon batches, maximizing ROI for serious growers - • **Complete 3-Component Kit:** Includes MasterBlend, Calcium Nitrate, and Epsom Salt in perfect proportions for hassle-free mixing - • **Trusted by Pros Worldwide:** Top-rated formula with 4.7 stars from 4,700+ reviews—join the elite growers’ club - • **Balanced Nutrient Powerhouse:** Optimized 4-18-38 NPK ratio fuels vigorous growth and lush greenery - • **Versatile Hydroponic Solution:** Ideal for both aerated systems and Kratky method—grow smarter, not harder ## Overview The MASTERBLEND 4-18-38 Complete Combo Kit is a professional-grade, water-soluble fertilizer system containing three precisely measured components—MasterBlend, Calcium Nitrate, and Epsom Salt—in a 1:1:0.5 ratio. Designed for hydroponics and soil-less growing methods like Kratky, this 2.5-pound kit delivers balanced nutrition that promotes rapid, healthy plant growth and flowering. Trusted globally by growers, it offers convenience, versatility, and proven results in a compact, easy-to-use package. ## Description The MasterBlend Combo Kit contains all 3 concentrated components needed. The MasterBlend recipe calls for 12g MasterBlend, 12g Calcium Nitrate, and 6g Epsom Salt to make 5 gallons of nutrient solution, where each component is mixed into the water individually. Available in quanties from 1lb to 62.5 pounds. Packed in clear bags by PowerGrow Systems (authorized MasterBlend distributor). The 2.5 Pound Kit contains: 1LB MasterBlend, 1LB Calcium Nitrate, 0.5LB Epsom Salt. Review: A Complete Game Changer for Hydroponics and Kratky Method! - I have been using the MASTERBLEND 4-18-38 Complete Combo Kit for my hydroponics and Kratky method, and let me tell you, it's a game changer! With its 100% effectiveness, this kit has truly transformed my growing experience. The nutrient mix provided in this kit is exceptional. It has all the essential elements plants need for healthy growth, resulting in vigorous and lush greenery. The balanced ratio of 4-18-38 ensures optimal nutrient uptake, giving my plants the perfect blend of nitrogen, phosphorus, and potassium. What I love most about this kit is its versatility. Whether I'm using hydroponics or the Kratky method, the MASTERBLEND formula consistently delivers outstanding results. It's convenient to use and saves me the hassle of managing multiple nutrient solutions. The quality of the product is top-notch. The ingredients are of the highest standard, ensuring that my plants receive the best nutrition. I've seen remarkable improvements in growth, flowering, and overall plant health since I started using this kit. If you're into hydroponics or the Kratky method, the MASTERBLEND 4-18-38 Complete Combo Kit is an absolute must-have. It's a complete game changer that will take your growing to new heights. I highly recommend it for both beginners and experienced growers. Trust me, you won't be disappointed! Review: Perfect for Hydroponics! - A lot of YouTubers recommended this so I thought I'd give it a try. When it arrived, I was quite surprised how small the packages were, but it matched the description so that's on me. That said, a little goes a long way. I've used this in both a system with aeration and without (Kratky method) and it worked perfectly in both cases. Here's what I've grown with it: - Basil indoors with natural light - Basil indoors with artificial light - 2 kinds of Lettuce indoors with artificial lights - Spinach indoors with artificial lights - 2 types of tomatoes outdoors with natural light. The Plant growth with this fertilizer and the hydroponic method was far superior to similar plants planted in dirt. The plants that had aeration did better the ones in using the Kratky method. I don't think I'll try tomatoes again simply because they take so much solution throughout the year vs. the ones I planted in self watering soil containers. Overall, 5 stars. Works as well as the YouTubers claimed it would and lasts a long time. ## Features - MasterBlend 4-18-38 Master Kit (3 Separate Components in correct amounts) - Contains MasterBlend 4-18-38, Calcium Nitrate 15.5-0-0, and Epsom Salt (Magnesium Sulfate) - Used by professionals worldwide for optimum plant growth - 100% Water Soluble for easy plant uptake - Packed by weight in a 1/1/0.5 ratio based off the MasterBlend recipe of 12g MB, 12g, CN, and 6g ES ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B072F2BL9D | | Best Sellers Rank | #10,102 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #313 in Garden Fertilizers | | Brand | MasterBlend | | Brand Name | MasterBlend | | Coverage | Full | | Customer Reviews | 4.7 out of 5 stars 4,731 Reviews | | Item Form | Powder | | Item Weight | 10 Pounds | | Liquid Volume | 5 Liters | | Manufacturer | MasterBlend | | Mixing Ratio | 1:1:0.5 | | Model Number | MASTERBLEND-COMBO_2.5LB-KIT | | Number of Packs | 1 | | Part Number | AACXZSG-119 | | Specific Uses For Product | Plant Growth | | Target Species | Plants | | Unit Count | 1 Count | ## Product Details - **Brand:** MasterBlend - **Item Form:** Powder - **Item Weight:** 10 Pounds - **Liquid Volume:** 5 Liters - **Specific Uses For Product:** Plant Growth ## Images ![MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) - Image 1](https://m.media-amazon.com/images/I/81IOGyGwDGL.jpg) ![MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) - Image 2](https://m.media-amazon.com/images/I/813Erg2v3NL.jpg) ![MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) - Image 3](https://m.media-amazon.com/images/I/81nqNsGtMKL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: I am planting lettuce using hydroponic, my tank is 70liters , what is the mixture for lettuce for my size of tank** A: The common formula seems to be 10G + 10G + 5G in 5 gallons of water for lettuce. 70 liters = about 18.5 gallons. I'll just make my math 18.5 gallons divided by 5 gallons = 3.7 So it would be 37G + 37G + 18.5G . I imagine most people would say 2G + 2G + 1G per gallon. 70 liters = 18.5 gallons, so once again the answer is 37G of Calcium + 37 of Masterblend + 18.5G of Epsom salt. **Q: How long would the 25 pound kit last for a average hydroponics user? Many years? Any examples from your guy's own experience?** A: Yes for me it will last years I have 2 55 gallon drums with a cucumber and watermelon plant in each. And 10 5 gallon buckets with a mix of cucumbers tomatoes and peppers. 2 plants in each I will not put anything with cucumbers next year they drink too much. And two 7 gallon seed starting tubs. Anyway I could do this for years. On the amount I have and I mixed up 20 or so gallons for other people. **Q: Does this generally tend to raise or lower pH?** A: Lowers the ph . If I use my tap water which is about 8.3 it ends up perfect at 5.6 to 5.9 . If I use rain water which is closer to 7 it ends up a tad too low so I add ph up. **Q: May I use this fertilizer for chili pepper plants growing in the ground?** A: Yes you can. I made a batch of this solution and used it on peppers in the garden and I had the most bountiful harvest of peppers possible. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Complete Game Changer for Hydroponics and Kratky Method! *by I***C on June 14, 2023* I have been using the MASTERBLEND 4-18-38 Complete Combo Kit for my hydroponics and Kratky method, and let me tell you, it's a game changer! With its 100% effectiveness, this kit has truly transformed my growing experience. The nutrient mix provided in this kit is exceptional. It has all the essential elements plants need for healthy growth, resulting in vigorous and lush greenery. The balanced ratio of 4-18-38 ensures optimal nutrient uptake, giving my plants the perfect blend of nitrogen, phosphorus, and potassium. What I love most about this kit is its versatility. Whether I'm using hydroponics or the Kratky method, the MASTERBLEND formula consistently delivers outstanding results. It's convenient to use and saves me the hassle of managing multiple nutrient solutions. The quality of the product is top-notch. The ingredients are of the highest standard, ensuring that my plants receive the best nutrition. I've seen remarkable improvements in growth, flowering, and overall plant health since I started using this kit. If you're into hydroponics or the Kratky method, the MASTERBLEND 4-18-38 Complete Combo Kit is an absolute must-have. It's a complete game changer that will take your growing to new heights. I highly recommend it for both beginners and experienced growers. Trust me, you won't be disappointed! ### ⭐⭐⭐⭐⭐ Perfect for Hydroponics! *by S***E on December 19, 2025* A lot of YouTubers recommended this so I thought I'd give it a try. When it arrived, I was quite surprised how small the packages were, but it matched the description so that's on me. That said, a little goes a long way. I've used this in both a system with aeration and without (Kratky method) and it worked perfectly in both cases. Here's what I've grown with it: - Basil indoors with natural light - Basil indoors with artificial light - 2 kinds of Lettuce indoors with artificial lights - Spinach indoors with artificial lights - 2 types of tomatoes outdoors with natural light. The Plant growth with this fertilizer and the hydroponic method was far superior to similar plants planted in dirt. The plants that had aeration did better the ones in using the Kratky method. I don't think I'll try tomatoes again simply because they take so much solution throughout the year vs. the ones I planted in self watering soil containers. Overall, 5 stars. Works as well as the YouTubers claimed it would and lasts a long time. ### ⭐⭐⭐⭐⭐ Optimize Plant Nutrition with MASTERBLEND 4-18-38 Fertilizer Combo Kit! 🌿 *by A***D on July 10, 2024* Let's dive into the MASTERBLEND 4-18-38 Complete Combo Kit, your go-to solution for balanced and effective plant nutrition! 🌱 Ideal for hydroponic systems and traditional gardening, this bulk kit provides everything you need to nourish your plants with essential nutrients. The 4-18-38 formula is renowned for its balanced blend of nitrogen, phosphorus, and potassium, crucial for robust growth and vibrant blooms. What makes this fertilizer kit stand out is its versatility and effectiveness. Whether you're growing vegetables, flowers, or herbs, MASTERBLEND ensures your plants receive the optimal nutrition to thrive. Since using the MASTERBLEND 4-18-38 Complete Combo Kit, gardeners have seen impressive results in plant health and yield, making it a trusted choice for both beginners and seasoned growers alike. If you're passionate about maximizing plant growth and productivity, look no further than the MASTERBLEND 4-18-38 Complete Combo Kit. It's your key to achieving lush, healthy plants with every application! 🌟 ## Frequently Bought Together - MASTERBLEND 4-18-38 Complete Combo Kit Fertilizer Bulk (2.5 Pound Kit) - Calcium Nitrate 15.5-0-0 Fertilizer Bulk Pricing (25 POUNDS) - Southern Ag Calcium Nitrate - 5 Pound Bag --- ## 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.co.uk/products/42223037-masterblend-4-18-38-complete-combo-kit-fertilizer-bulk-2](https://www.desertcart.co.uk/products/42223037-masterblend-4-18-38-complete-combo-kit-fertilizer-bulk-2) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-07-02*