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A three-part hydroponic nutrient kit built around the classic MasterBlend recipe: 4-18-38 base fertilizer, calcium nitrate 15.5-0-0, and Epsom salt, packed separately in a 1:1:0.5 ratio. The high-phosphorus, high-potassium formula pushes flowering and fruiting rather than leafy growth, which is why it is widely used for tomatoes and other fruiting vegetables. Keeping the three components separate matters: mixed together in advance, calcium and sulfate react and lock nutrients out as precipitate. Compared with buying each component alone, the kit saves the hunt for matching grades, but it is a working recipe, not a one-scoop feed, so it suits growers willing to weigh and mix in order.
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Lowest price we've seen: $24.99 on Nov 14 at Walmart. Tracked across 1 store since Nov 14.
Rated 4.5 out of 5 across 55 ratings, buyers treat it as a dependable way to get the full MasterBlend recipe without sourcing parts separately. The main friction is the mixing routine rather than the results.
This kit contains the three dry, water-soluble components of the classic MasterBlend fertilizer recipe: MasterBlend 4-18-38, Calcium Nitrate 15.5-0-0 and Epsom Salt (magnesium sulfate). They come in the proper amounts, so you don't need to buy each one separately.
The components are packed by weight in a 1/1/0.5 ratio. The recipe is 12 g MasterBlend, 12 g Calcium Nitrate and 6 g Epsom Salt for 5 gallons of nutrient solution. Mix each component into the water individually. The kit is not pre-mixed, because combining the components ahead of time can cause nutrient lockout and leave precipitates in the water.
The fertilizer is synthetic and 100% water soluble for easy plant uptake. It is recommended for vegetables such as tomatoes, indoors or outdoors.
