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Item Number: F1154

Garden Gypsum Prilled (5 lb box)

Loosens Clay Soils

Improving soil structure is one of the most important steps in creating a healthy garden, and Down To Earth™ Garden Gypsum offers a simple, effective solution. This natural soil conditioner provides a valuable source of calcium and sulfur while helping to enhance the physical properties of a wide range of soils. In heavy clay soils, it works to loosen compacted particles, increasing aeration and water infiltration. This improved drainage encourages deeper root growth and reduces the risk of waterlogging or root diseases.

Garden Gypsum is also highly beneficial for revitalizing alkaline, sodic, or saline soils, helping to displace excess sodium and restore a more balanced environment for plants. Its prilled form makes application easy, whether you’re working in vegetable beds, lawns, ornamental plantings, or large landscaping projects. By supplying 21% calcium and 17% sulfur, it not only improves structure but also contributes to strong cell walls, healthy foliage, and vibrant blooms.

For more soil improvement products, explore our Soil Amendments collection.

  • Derived From: Mined gypsum
  • Guaranteed Analysis: Calcium (21%), Sulfur (17%)
  • Primary Use: Loosens heavy clay soils, improves drainage
  • Additional Benefits: Helps remediate alkaline, sodic, or saline soils
  • Form: Prilled for easy application
  • Weight: 5 lb box
Listed for Use in Organic Agriculture by the Organic Materials Review InstituteApproved for Organic Agriculture by the California Department of Food and Agriculture
Quantity Discounts for Garden Gypsum Prilled (5 lb box)
Buy 3 for $10.79 each
Buy 5 for $10.19 each
$11.99
Discount applied. Offer ends soon.
Next-day shipping available

Check Your Zone Compatibility:

Shipping Information

Ships from Northern CA.

Shipping Weight: 6.0 lb

Dimensions: 11.0"L x 8.25"W x 3.0"H

Features

    Characteristics

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

    Use Instructions

    Lawns: In spring, apply 5-10 lbs per 100 square feet and water in well. Annual applications are recommended and results may be enhanced if applied following aeration.

    Vegetable Gardens & Flower Beds: To prepare new gardens, apply 2.5-5 lbs per 100 square feet by evenly distributing over soil surface by hand or spreader.

    Trees & Shrubs: Spread 1 lb per 1″ of trunk diameter around the base outwards to the drip line and water in well.

    Useful Information

    Guarantee

    View full details

    Customer Reviews

    Based on 3 reviews
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    F
    Frank Demsky
    Nice.

    I was looking for some gypsum for my pinguicula gypsicola and they have some. I didn’t even know it had so many other benefits.

    T
    Tiffany
    Improved clay soil

    Got this to improve the clay soil in one of my garden beds. It really helped, I'm glad I gave it a try.

    L
    Linda West
    Great calcium and sulfur product

    Wanted a source of calcium and sulfur for my garden. Love down to earth products.