---
product_id: 41762991
title: "MasterBlend 4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds)"
brand: "masterblend"
price: "€ 49.52"
currency: EUR
in_stock: true
reviews_count: 8
category: "Master Blend"
url: https://www.desertcart.ie/products/41762991-masterblend-4-18-38-tomato-and-vegetable-fertilizer-bulk-1
store_origin: IE
region: Ireland
---

# 4-18-38 NPK ratio for optimal fruiting 100% water soluble for easy mixing Available in bulk: 1, 5, or 25 lbs MasterBlend 4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds)

**Brand:** masterblend
**Price:** € 49.52
**Availability:** ✅ In Stock

## Summary

> 🌿 Grow like a pro, harvest like a boss!

## Quick Answers

- **What is this?** MasterBlend 4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds) by masterblend
- **How much does it cost?** € 49.52 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/41762991-masterblend-4-18-38-tomato-and-vegetable-fertilizer-bulk-1)

## 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

- • **Trusted by Hydroponic Pros:** World-renowned MasterBlend formula, a staple for commercial and home hydroponic growers alike.
- • **Effortless Mixing & Application:** 100% water soluble powder ensures quick dissolution and hassle-free feeding.
- • **Bulk Options for Serious Gardeners:** Choose from 1, 5, or 25-pound bags to match your garden scale and avoid frequent reorders.
- • **Precision Nutrition for Peak Yields:** Specially formulated 4-18-38 ratio targets fruiting & flowering plants like tomatoes and peppers.
- • **Boost Your Harvest with Balanced Feeding:** Use alongside Magnesium Sulfate and Calcium Nitrate for a complete nutrient profile and maximum growth.

## Overview

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a premium, water-soluble powder designed for fruiting and flowering plants in soil or hydroponic systems. Available in bulk sizes, it delivers a precise nutrient balance to maximize tomato and vegetable yields. Trusted by commercial growers, it requires pairing with Magnesium Sulfate and Calcium Nitrate for optimal results, making it the go-to choice for serious gardeners aiming for bountiful, healthy harvests.

## Description

MasterBlend fertilizers have been the go-to Hydroponic and Garden fertilizers for commercial gardeners for a long time. The Masterblend 4-18-38 fertilizer was specially developed for fruiting and flowering plants in both soil and hydroponic systems. It can be used alone as a bloom enhancer, or if you would like to use it as an all-in-one balanced formula, it is recommended to use the 4-18-38 together with Magnesium Sulfate (Epsom Salt) and Calcium Nitrate for a balanced water soluble fertilizer. 1 and 5 pounds will arrive in smaller packages. 25 pounds will be in the manufacturer's bag. It is recommended to use MasterBlend 4-18-38 in conjunction with Calcium Nitrate and Magnesium Sulfate (also available) in the following recipes... **Important! Do not mix the 3 components together! Doing so will cause nutrient lockout and all the nutrients will not be available to your plants. You can mix the MasterBlend and Epsom Salts together, but not the Calcium Nitrate! Ideally you should mix each component separately in your water until thoroughly dissolved before mixing the next component. 1 Gallon Recipe: 2.4 grams MasterBlend 4-18-38 2.4 grams Calcium Nitrate (15.5-0-0) 1.2 grams Magnesium Sulfate (Epsom Salt) 5 Gallon Recipe: 12 grams MasterBlend 4-18-38 12 grams Calcium Nitrate (15.5-0-0) 6 grams Magnesium Sulfate (Epsom Salt)

Review: Outstanding results - plants thriving! - Excellent fertilizer for tomatoes and vegetables! My plants have shown remarkable growth since using MasterBlend. The 4-18-38 formula provides perfect nutrition. Easy to mix and apply. The 5-pound bag lasts a long time. My tomato yield has increased significantly. Highly recommend for hydroponic or soil gardening!
Review: Great product for home vegetable gardens! - The MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a highly effective and versatile product, particularly valued by gardeners and hydroponic growers for its precision and results. While it requires some knowledge and experience to use effectively, the benefits in terms of plant health and crop yield make it a worthwhile investment for serious gardeners. Whether you're growing tomatoes, peppers, or other vegetables, this fertilizer can help you achieve bountiful and healthy harvests.

## Features

- MasterBlend 4-18-38 Fertilizer in Bulk
- Choose 1, 5, or 25 Pound Quantities of the Famous Masterblend 4-18-38 formula
- MasterBlend World renowned Hydroponic Vegetable Fertilizer for Peppers and Tomatoes!
- Super concentrated and easy to use!
- MasterBlend is 100% water soluble, and contains all the trace minerals needed!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B071V8B4FL |
| Best Sellers Rank | #62,823 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,478 in Garden Fertilizers |
| Brand | MasterBlend |
| Brand Name | MasterBlend |
| Coverage | Medium |
| Customer Reviews | 4.7 out of 5 stars 1,225 Reviews |
| Item Form | Powder |
| Item Weight | 5 Pounds |
| Manufacturer | MasterBlend |
| Mixing Ratio | 1:0.5:1 (MasterBlend 4-18-38: Magnesium Sulfate: Calcium Nitrate) |
| Model Number | MASTERBLEND 4-18-38 (5 POUNDS) |
| Number of Items | 1 |
| Specific Uses For Product | Plant Growth, Seed Development, soil gardening |
| Target Species | tomatoes, vegetables |
| UPC | 600150826026 |
| Unit Count | 80 Ounce |

## Product Details

- **Brand:** MasterBlend
- **Item Form:** Powder
- **Item Weight:** 5 Pounds
- **Manufacturer:** MasterBlend
- **Specific Uses For Product:** Plant Growth, Seed Development, soil gardening

## Images

![MasterBlend 4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds) - Image 1](https://m.media-amazon.com/images/I/71qG3EmNicL.jpg)

## Questions & Answers

**Q: Anybody use this for rdwc or dwc**
A: I've been using this with all my hydroponics, Kratky Method, Aeroponics, DWC, etc.
Won't use anything else. Great results!

**Q: Is this organic? Thanks.**
A: N-P-K and trace elements are all inert chemical elements. Plants ingest these chemicals using the bacterial and fungi in the soil. Your soil may have other organic material; some of which freaks down into N-P-K and trace elements in varying degrees depending on the material which has been composted.   Elements are inert.  Nitrogen is Nitrogen is Nitrogen.  They are not organic. You have to look at the data sheets and figure how much fertilizer you are adding to you plants to keep them fed.   You can call Masterblend and talk to their staff who can advise you on dosage.  I normally use 12 Grams of 4-18-15 in 5 gallons of water along with 6 0z of Epson Salt (adds Magnesium which helps absorb trace elements plants also need)  and 12 grams of 10-58-17. I occasionally use 12  Grams of 15-0-0 Calcium Nitrate for Blossom End Rot in tomatoes along with my 4-18-38 12 grams each in 5 gallons of water. NOTE This is very heavy feeding in a Hydroponic Dutch Bucket Tomato system. You need to come up with a dosage that works for you and should check on recommended mixtures any your garden or hydroponic setup.

**Q: How often should I apply to the garden**
A: Can you use this product in regular soul in your vegetable garden

**Q: Is there CL (clorine) is this as a trace element?**
A: It's not listed on the bag.  I've had great luck with this I grow hydroponic tomatoes, lettuce, swiss chard, squash, and even hydroponic corn in dutch buckets (which is doing pretty well so far but this is an experiment).   I forget if it says in the description, but I mix equal parts of this and calcium nitrate with 1/2 as much epsom salts.  for 5 gallons of water that is 12 grams each of masterblend and calcium nitrate, and 6 grams of epsom salts.  Food grows like crazy and tastes great.  I have tomatoes in soil that are not growing as well as the dutch bucket tomatoes.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Outstanding results - plants thriving!
*by A***W on December 6, 2025*

Excellent fertilizer for tomatoes and vegetables! My plants have shown remarkable growth since using MasterBlend. The 4-18-38 formula provides perfect nutrition. Easy to mix and apply. The 5-pound bag lasts a long time. My tomato yield has increased significantly. Highly recommend for hydroponic or soil gardening!

### ⭐⭐⭐⭐⭐ Great product for home vegetable gardens!
*by B***. on August 8, 2024*

The MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a highly effective and versatile product, particularly valued by gardeners and hydroponic growers for its precision and results. While it requires some knowledge and experience to use effectively, the benefits in terms of plant health and crop yield make it a worthwhile investment for serious gardeners. Whether you're growing tomatoes, peppers, or other vegetables, this fertilizer can help you achieve bountiful and healthy harvests.

### ⭐⭐⭐⭐⭐ fertilizer for cacti and succulents
*by H***W on April 18, 2025*

i use it for cacti and succulent . works very well

## Frequently Bought Together

- MasterBlend 4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds)
- Calcium Nitrate 15.5-0-0 Fertilizer Bulk Pricing (5 POUNDS)

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-04*