Is MasterBlend on Sale? November 2026

Buying guides that pick MasterBlend

• 
  Buying guide · 10 picksBest soluble fertilizer salts for hydroponics

Questions and answers

What is in the MasterBlend 4-18-38 Master Kit?

The kit combines the 4-18-38 base powder with calcium nitrate and magnesium sulfate, the three parts most hydroponic tomato and pepper growers mix together. The bulk kit is sized for growers running reservoirs through a full season.

How do you mix MasterBlend 4-18-38?

Dissolve the 4-18-38 first, then add calcium nitrate and magnesium sulfate separately so the calcium and sulfate do not bind in concentrate. Follow the ratio printed on the package and check reservoir pH after mixing.

Is MasterBlend good for soil gardens or only hydroponics?

It works in both. Hydroponic and drip growers use it as a complete nutrient program, while soil gardeners use it as a soluble feed during fruiting, when tomatoes and peppers draw heavily on potassium and phosphorus.

Does MasterBlend have a warranty or return policy?

MasterBlend sells through retailers, so returns and refunds follow the policy of the store you buy from. Check that store's terms before ordering, especially on bulk kits.

When does MasterBlend go on sale?

Garden suppliers tend to discount soluble fertilizers around spring planting and again at the end of the growing season. The price history on this page shows when each store has moved on this product.

Are there MasterBlend discount codes?

Deal.ai checks what MasterBlend products actually cost at every store, so a real markdown shows on this page as a deal as soon as it starts, and each product's page has its price history to tell a sale from its usual price.