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4-18-38 Tomato & Vegetable Fertilizer - Bulk 1, 5 or 25 Pounds (5 Pounds)

4.7 4.7 out of 5 stars 1,140 ratings
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Brand MasterBlend
Item Weight 5 Pounds
Item Form Powder
Coverage Medium
Specific Uses For Product Plant Growth, soil gardening, Seed Development

About this item

  • 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!

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Item Weight ‏ : ‎ 5 Pounds
  • Item model number ‏ : ‎ MASTERBLEND 4-18-38 (5 POUNDS)
  • Date First Available ‏ : ‎ April 24, 2017
  • Manufacturer ‏ : ‎ MasterBlend
  • ASIN ‏ : ‎ B071V8B4FL
  • Customer Reviews:
    4.7 4.7 out of 5 stars 1,140 ratings

Product 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)

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
1,140 global ratings

Customers say

Customers like the quality, performance, ease of use, and value of the fertilizer. They mention that it's great for blooming and fruiting, works well in hydroponic systems, and is easy to mix and apply with hose.

AI-generated from the text of customer reviews

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PerformanceQualityValueEase of useEase of dissolvabilityCompleteness
46 customers mention "Performance"43 positive3 negative

Customers are satisfied with the performance of the fertilizer. They mention that it works great in their dutch bucket hydroponic system, produces outstanding results, and works fine for hydroponia veggies. Some say that it mixes easy, cheap, and has no deficiencies when used with calcium nitrate.

"Works great with my hydroponics" Read more

"Bought it for my mom. It works wonders with her plant." Read more

"This fertilizer has worked great in my dutch bucket hydroponic system...." Read more

"...Mixes easy, cheap, and no deficiencies when used with calcium nitrate, and magnesium sulfate" Read more

26 customers mention "Quality"26 positive0 negative

Customers are satisfied with the quality of the fertilizer. They mention that it is great for blooming and fruiting, and it promotes more blooms and produce. Some say that it dissolves easily and is excellent for hydroponics.

"Great for hydrophobic vegetable growing" Read more

"...Almost see the plants growing" Read more

"...Insane amounts of hot peppers and my tomatoes produced such beautiful tomatoes the neighbors were really jealous!" Read more

".../ garden / etc there is NOTHING better for veggies and the flowers really shine for it too" Read more

16 customers mention "Value"14 positive2 negative

Customers like the value of the fertilizer. They say it works great for all their vegetables, fruits, and flowers. Some customers also mention that the seller goes the extra mile to make them happy.

"...I was happy to find a comparably priced alternative that is working great so far. Much better value than any liquid hydroponic fertilizers!" Read more

"...Mixes easy, cheap, and no deficiencies when used with calcium nitrate, and magnesium sulfate" Read more

"...My plants love this blend and it dissolves easily. Good value." Read more

"This product is the best value for my hydroponics plants.It's very water soluble and is the base for my nutrient solution...." Read more

13 customers mention "Ease of use"13 positive0 negative

Customers find the fertilizer easy to add, use, and mix. They also say it goes into solution easily, and is easy to measure, mix, and apply with a hose.

"I’ve had plants that were struggling and this perked them right up. Easy to use and works" Read more

"I love the ease of mixing and ability to add additional water soluble nutrients as well...." Read more

"The product is easy to use, but not sure of it effectiveness, and it is a little pricey" Read more

"Easy to mix and apply with hose." Read more

3 customers mention "Ease of dissolvability"3 positive0 negative

Customers find the fertilizer dissolves easily and doesn't clump. They also say the new formula doesn's clup easily when exposed to moisture.

"...My plants love this blend and it dissolves easily. Good value." Read more

"Dissolves easily, plants love it, seeing rapid growth." Read more

"New formula doesn’t clump easy when exposed to moisture and dissolves the same as the last blend" Read more

3 customers mention "Completeness"0 positive3 negative

Customers are dissatisfied with the completeness of the fertilizer. They mention that the packaging is poor, incorrect, and not enough. Some customers also say that the product may not be Masterblend.

"Incorrect and not enough , withheld full product info,product Information,would not Buy again, no No......" Read more

"May not be Masterblend. Bate and switch knockoff???..." Read more

"Poor packaging/Not complete..." Read more

OMW
5 Stars
OMW
This has been the best. Almost see the plants growing
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Top reviews from the United States

Robert
5.0 out of 5 stars Hydroponics
Reviewed in the United States on June 23, 2024
Verified Purchase
Works great with my hydroponics
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tractor
5.0 out of 5 stars Masterblend fertilizer
Reviewed in the United States on June 11, 2024
Verified Purchase
Great for hydrophobic vegetable growing
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Dennis Zhen
5.0 out of 5 stars Great product
Reviewed in the United States on April 18, 2024
Verified Purchase
Bought it for my mom. It works wonders with her plant.
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smores
4.0 out of 5 stars Your Tomato Plants Will Love YOu
Reviewed in the United States on June 12, 2023
Verified Purchase
This fertilizer has worked great in my dutch bucket hydroponic system. I had previously used a different brand with good results, but that brand was discontinued. I was happy to find a comparably priced alternative that is working great so far. Much better value than any liquid hydroponic fertilizers!
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smores
4.0 out of 5 stars Your Tomato Plants Will Love YOu
Reviewed in the United States on June 12, 2023
This fertilizer has worked great in my dutch bucket hydroponic system. I had previously used a different brand with good results, but that brand was discontinued. I was happy to find a comparably priced alternative that is working great so far. Much better value than any liquid hydroponic fertilizers!
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2 people found this helpful
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Amazon Customer
5.0 out of 5 stars Easy to add and or use.
Reviewed in the United States on March 8, 2024
Verified Purchase
Love this stuff.
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Amazon Customer
5.0 out of 5 stars Easy to add and or use.
Reviewed in the United States on March 8, 2024
Love this stuff.
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Erin Robbs
5.0 out of 5 stars OMW
Reviewed in the United States on May 25, 2024
Verified Purchase
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 This has been the best. Almost see the plants growing
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Erin Robbs
5.0 out of 5 stars OMW
Reviewed in the United States on May 25, 2024
This has been the best. Almost see the plants growing
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Thyme
5.0 out of 5 stars Outstanding
Reviewed in the United States on June 24, 2024
Verified Purchase
Buy this every year..
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Ryan
5.0 out of 5 stars Cannabis approved
Reviewed in the United States on February 20, 2024
Verified Purchase
I've been using this product for cannabis for about 6 runs now, and it is perfect. Mixes easy, cheap, and no deficiencies when used with calcium nitrate, and magnesium sulfate
7 people found this helpful
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