MasterBlend 4-18-38 Tomato & Vegetable Fertilizer

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer

MasterBlend 4-18-38 Tomato & Vegetable Fertilizer

MasterBlend fertilizers have been the go-to hydroponic and garden fertilizers for commercial gardeners for a long time. Their 4-18-38 Tomato and Vegetable Fertilizer provides proven results time after time. Because of the unique composition, it is recommended to use the 4-18-38 together with Magnesium Sulfate (Epsom Salt) and Calcium Nitrate for the ultimate balanced water soluble fertilizer.

NOTE: We are an authorized dealer of MasterBlend, and we are authorized to repack it in smaller quantities. 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 Instructions

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. DO NOT BUY KITS THAT ARE PREMIXED!

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)

MasterBlend 4-18-38 Fertilizer in Bulk

Choose from 1, 5, or 25 pound quantities of MasterBlend 4-18-38 Tomato & Vegetable Fertilizer. This world-renowned hydroponic vegetable fertilizer is perfect for peppers and tomatoes. It is super concentrated and easy to use. Plus, it is 100% water soluble and contains all the trace minerals needed for healthy plant growth.

Key Features:

  • World-renowned hydroponic vegetable fertilizer
  • Super concentrated and easy to use
  • 100% water soluble
  • Contains all the trace minerals needed

Frequently Asked Questions

Q: Can I mix MasterBlend 4-18-38 with other fertilizers?

A: It is not recommended to mix MasterBlend 4-18-38 with other fertilizers. It is best to use it as directed for optimal results.

Q: How often should I apply MasterBlend 4-18-38?

A: The frequency of application depends on the specific needs of your plants. It is recommended to follow the instructions provided and adjust as necessary based on the growth and health of your plants.

Q: Is MasterBlend 4-18-38 suitable for all types of vegetables?

A: While MasterBlend 4-18-38 is specifically formulated for tomatoes and peppers, it can also be used for other vegetable plants. However, it is always best to consult the specific fertilizer requirements for each type of vegetable.


MasterBlend 4-18-38 Tomato & Vegetable Fertilizer is a trusted choice for commercial gardeners and hydroponic enthusiasts. Its unique composition and proven results make it an excellent option for achieving healthy and productive plants. With its super concentrated formula and easy-to-use nature, it is a convenient choice for both beginners and experienced gardeners. Choose from 1, 5, or 25 pound quantities and give your plants the nutrients they need for optimal growth.