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Item Number: PSA800

Humax (Gallon)

To Enhance Micronutrient Uptake

Humax is a concentrated humic acid product designed to improve soil health and nutrient availability for a wide range of crops and plants. Derived from high-quality leonardite, it contains 12% humic acids that help stimulate beneficial soil biology, enhance root growth, and increase the uptake of essential micronutrients such as calcium, phosphorus, magnesium, and iron. Humic acids also improve soil structure, aiding water retention and reducing nutrient leaching.

Suitable for use as either a soil drench or a foliar application, Humax is compatible with most fertilizer solutions as well as biological and enzymatic formulations, making it easy to integrate into existing fertility programs. Lower foliar application rates can improve the efficiency of nutrient absorption, while higher soil application rates deliver long-lasting benefits to soil quality and plant vigor. Its versatility makes it an excellent choice for use in vegetable gardens, orchards, vineyards, and ornamental plantings.

Whether you’re looking to boost nutrient uptake during the growing season or improve long-term soil fertility, Humax offers a natural, effective solution to support healthy plant growth.

Explore more soil health solutions in our Soil Amendments collection.

  • Active Ingredient: 12% humic acids from leonardite
  • Foliar Rate: 4–16 oz/acre to enhance nutrient uptake; 16–32 oz/acre standard application
  • Soil Rate: 32–64 oz/acre in water or fertilizer solutions
  • Application: Soil drench or foliar spray
Listed for Use in Organic Agriculture by the Organic Materials Review InstituteApproved for Organic Agriculture by the Washington State Department of AgricultureApproved for Organic Agriculture by the California Department of Food and Agriculture
$22.99
Next-day shipping available

Check Your Zone Compatibility:

Shipping Information

Ships from Northern CA.

Cannot ship to the following states: AR, KS, IL, MD, OK, SD

Shipping Weight: 12.0 lb

Dimensions: 10.25"L x 7.0"W x 5.0"H

Features

  • Improves Nutrient Uptake

Characteristics

Organic Status: Certified Organic Product
Organic Certifier: OMRI, WSDA, CDFA

Use Instructions

Useful Information

Guarantee

View full details

Customer Reviews

Based on 6 reviews
67%
(4)
33%
(2)
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V
Victoria T.
Super helpful for improving soil quality.

I wasn’t familiar with humic acids before, but after adding Humax to my garden routine, I noticed healthier growth. This stuff made it easier for the roots to take advantage of the nutrition that was already sitting at the base of my pumpkin plants. Now they are producing more flowers. My cucumbers bounced back during hot spells too!

E
Eric
Compost tea

Perfect for making compost tea.

T
Thad Little
Tested on my peppers...

So, I added this to my normal fertilizer mix and fed it to half of my peppers. The other half of my peppers were fed with the normal mix. Not exactly scientific, but the results were promising. The peppers that got the humic acid added grew larger, had more fruit set, had a healthier appearance, and produced larger peppers.

M
MEP
works

Good stuff. The tomatoes were very happy this year!

L
Lucas
Good Product

This is a great product for Compost Tea, but it does have a higher PH.