The Most Trusted Agricultural Gypsum Supplier Since 1932 | Soil Amendments, Soil Sampling, Agronomy, Spreading Services for Agriculture2026-03-19T21:19:24-07:00

Putting Your Soil First

California’s most trusted agricultural gypsum supplier and agronomy partner since 1932

Known as the industry’s most-trusted agricultural gypsum provider since 1932, Holloway has helped farmers maximize crop and soil health with quality soil amendments, agronomy and redevelopment services for over 90 years.

Best Gypsum for Agriculture

Our Products

Along with mining its own gypsum, Holloway carries a wide variety of soil amendments, fertilizers and nutrients to get your soils right.

Our Services

Holloway’s soils-first services include material delivery, spreading, custom agronomy and complete Grave-to-Cradle redevelopment.

Resources

Visit our resources page for company news, agronomy-related blog posts and grower-focused grant information.

Latest From The Blog

Grower Testimonial: Corbitt Smith, Reina Rosa Farming

When it comes to growing roses in Wasco, Corbitt Smith, owner of Reina Rosa Farming, says it starts with the foundation beneath his boots. “One of the most important things about growing roses here is the soil,” he said. “Wasco is a great place to grow anything, and I think the ground is the key there.”

Improving Infiltration and Reducing Ponding

Having infiltration and ponding issues? Check out the November edition of West Coast Nut, for an article from our own Senior Agronomist Allie Cushnyr, discussing practical solutions for “Improving Infiltration and Reducing Ponding."

Providing Tools for Growth

Our diverse portfolio of soil amendments means that you will get the exact product for your particular soil need.

MATERIALS DELIVERY

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CUSTOM BLENDING

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SPREADING

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