Skip to product information
1 of 4
In Stock

Item Number: F1153

Diamond K Solution Grade Gypsum (50 lb)

Organic-Friendly Gypsum Powder for Improved Soil Health

Improve soil structure, enhance water infiltration, and promote plant health with Diamond K gypsum powder—a high-purity, ultra-fine powdered gypsum ideal for home gardens and certified organic farms.

This 50 lb bag contains 97% pure calcium sulfate dihydrate (22% calcium, 18% sulfur). The fine particle size (92% passing through a 325-mesh screen) ensures quick solubility for dry applications, soil drenches, or fertigation systems.

Key Benefits:

  • Loosens Compacted Soils: Breaks up clay and heavy soils for better aeration and root development.
  • Improves Water Management: Increases both drainage and moisture retention in poorly draining soils.
  • Boosts Soil Fertility: Supplies essential nutrients that support plant metabolism and beneficial microbial activity.
  • Certified Organic: OMRI-listed and free of synthetic additives, making it ideal for sustainable gardening.

Application Guidelines:

  • Garden Beds: 5–10 lbs per 100 sq. ft.
  • Container Plants: 1–2 tablespoons dissolved in 5 gallons of water.
  • Field Use: 50–400 lbs per acre (soil); 1–10 lbs per acre (foliar spray).

Diamond K powdered gypsum is a fast-acting, easy-to-apply solution for loosening soil, improving water movement, and increasing nutrient availability. Its high purity and solubility make it a reliable soil amendment for gardeners, landscapers, and organic growers.

Complete your soil health program with our full range of natural and organic fertilizers for sale and soil amendments.

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
Quantity Discounts for Diamond K Solution Grade Gypsum (50 lb)
Buy 10 for $16.19 each
Buy 25 for $15.29 each
$17.99
Next-day shipping available

Check Your Zone Compatibility:

Shipping Information

Ships from Northern CA.

Does not qualify for Flat Rate Shipping.

Shipping Weight: 52.0 lb

Dimensions: 21.5"L x 15.5"W x 5.5"H

Features

    Characteristics

    Organic Status: Certified Organic Product
    Animal-Based : No
    Fertilizer Type : Water-Soluble
    Major Nutrients : Calcium
    Major Nutrients : Sulfur
    Nutrient Release Rate : Immediate (0-1 Months)
    Use as Foliar : Yes
    Organic Certifier: OMRI, WSDA, CDFA

    Use Instructions

    Useful Information

    Guarantee

    View full details

    Customer Reviews

    Based on 15 reviews
    93%
    (14)
    7%
    (1)
    0%
    (0)
    0%
    (0)
    0%
    (0)
    B
    Bala
    Seems effective!

    It seems to work great on my ginger by providing the Calcium without raising the pH. And it was a great price too!

    K
    Kim
    Very pleased!

    We’ve purchased many amendments from this company and they are all awesome! We are extremely pleased with how happy our plants are now that we are feeding them! We Highly recommend them!

    J
    Jonathan
    It’s gypsum

    Its Nice quality gypsum. Mushrooms seem to be doing very well.

    K
    Keith Palmer
    Extremely Satisfied

    I have been using this product for about 3 years now to clear up muddy pond water and it works wonders making water crystal clean. Have not found anything else I've tried as good and economically priced as this and peaceful valley gets it out right away all the way to Mississippi. Happy with their service

    K
    Keith Palmer
    Extremely Satisfied

    I know this product has alot of uses but I've been using it to clear up the water in my new pond until I get some grass growing around it. Every time we have a big rain it washes this red clay into it and kinda muddied or clouds up thr water to where my fish can't see how to eat. They are sight feeders and this product is harmless to fish and it works great. Better than anything I've tried and have used it a few times. My biggest problem is I'm in Mississippi & it's in California. I can't find it anywhere else and st a price I can afford. I love it. Really does the job