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Masterblend Fertilizer

(11 customer reviews)



1, 5, 25 lb bags

Guaranteed analysis:

Total Nitrogen   4.00%

Available Phosphoric Acid  18.00%

Soluble Potash   38.00%

Magnesium   .50%

Boron  .20%

Copper  .10%

Iron  .40%

Manganese  .20%

Molybdenum  .01%

Zinc  .10%

Due to new requirements, we are no longer able to ship Masterblend outside the USA.



Tomato Fertilizer 4-18-38
A special fertilizer mix used for growing tomatoes, peppers and other vegetable crops. Can be used in the greenhouse or in the field. Water soluble. Works great in drip irrigation systems. Not a foliar feed fertilizer.

Lettuce Formula 8-15-36 This premium grade lettuce formula is designed for super lettuce growth. It is blended for mazimum leafy growth. Idea for hydroponic growers or home gardeners.

A $ 14.38 flat rate box holds 3 to 4 – 5# bags or 1 – 25# bag and ships anywhere in the US.

The recipe for use in a hydroponic system is 12 grams Masterblend 12 grams calcium nitrate 6 grams magnesium per 5 Gallons

Additional information


Tomato, Lettuce


21-25# bags, 1 lb bag, 25 lb bag, 5 lb bag, 5-25# bags

11 reviews for Masterblend Fertilizer

  1. 5 out of 5


    Arrived quickly and nicely packaged. Will order again!

  2. 5 out of 5


    I have been using Masterblend for a few years now, with the last couple years purchasing from Morgan county seeds. Fast/prompt order fulfillment and shipping. Will continue to do business with them and recommend them to others.

  3. 5 out of 5


    Been using Masterblend tomato for years now and it will grow anything you feed it to. I always get the best price from morgan county seeds, it works for hydroponics or soil. Don’t waste your money on bottles of watered down expensve liquid fertilizer with flashy names and full of dyes. A few pounds of this lasts me years, and everything that I’ve grown with tastes great.

  4. 5 out of 5


    Suprise to see that they ship to Guam.
    Can’t wait for my packages!

    Super exited!

    671hydro gardening

  5. 5 out of 5


    Second year using in square foot gardens and hydroponic system. Incredible results. Mix 2:2:1 masterblend:calicum:Epson salt. Info in catalog. Excellent tasting tomatoes and peppers. This year trying pumpkin giant variety with masterblend. Raspberries and blackberries excel with formula.

  6. 5 out of 5


    This is my first year using Masterblend Tomato Fertilizer and first year for hydroponics. I am more than pleased with the results that I have gotten so far. I ordered the smallest quantities that I could, just to see what the results were going to be. I am back to order some more because I am astounded by my hydro tomatoes.

  7. 5 out of 5


    Excellent product. I’ve used Masterblend to grow all my leafy greens, including Lettuce like Anuenue, Manoa, and Red Lettuce, Arugula, Red Russian Kale, Bok Choi, Won Bok and Parris Island Cos. Have had excellent results with Green Eggplants, Stringless String Beans, and Roma Tomatoes. All using the Kratky Non-Circulating method.

    But most important to me was the amazing service received from Morgan County Seeds. Quick delivery to Hawaii … Product well packed to make the journey … and a very reliable staff.

    Thanks Morgan County Seeds,
    Matsu @ moms.mini.farm

  8. 5 out of 5


    Ordered masterblend for 4th year of hydroponics as I was tired of the expense of brainless ‘A plus B’ liquids or near brainless A B C liquids. The masterblend works very very well. My growth in 3 hydroponic towers with varied plants has been excellent.

  9. 5 out of 5


    Friendly excellent service! Fast shipping! Awesome products! about the master blend and the calcium nitrate for hydroponics but I ended up using it on my entire garden and it works fantastic!

  10. 5 out of 5


    I have used masterblend in 3 hydroponic towers with multiple crops. Always awesome. I even tried with strawberries and was shocked that it was far superior to the ‘strawberry specific’ mix that I also purchased.

  11. 5 out of 5


    Ive been through expensive A plus B for 2 unsuccessful years. I was told about Masterblend and my vegetables continuously growing. I’ve been using Masterblend for 2 yrs with 3 successful tower-gardens. I’m ordering to try it on my grass.

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