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Humboldt Ag Supply can help you grow. Get in touch to schedule your soil test, set up an account, or explore our products.

Toll-Free

855-707-Farm

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Our Roots

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We opened Trinity River Garden Center way back in 2010 to serve small gardens in our Willow Creek community. We soon realized that we could help out independent farmers that have been relying on outdated information or agricultural folklore.

Since 2013, Humboldt Ag Supply has been offering sustainable fertilizers to small farms throughout Northern California.

We’re taking a precise, data-driven approach to soil fertility management. We’re promoting science on the farm and helping the modern farmer grow — moving away from potting media replacement toward informed nutrient application. And with the experience and expertise of our team of ag industry veterans, we’re making it easier than ever.

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Let's Grow

Beyond our extensive products, we offer soil testing services, custom amendment planning, soil blending, material delivery and more.

If you’re interested in Farm Direct pricing, contact us to set up an account.

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Make it a
Humboldt day

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On the Ground

Prep your starts early to beat the spring rush. Once your greenhouse is at capacity, identify and implement a pest management strategy that will keep your garden happy and healthy.