Worm Castings (15 lb bag) vs Azomite Rock Dust

Worm castings and Azomite are both soil amendments, but they serve different purposes. Castings are a biological amendment — they feed soil microbes and improve structure. Azomite is a mineral amendment — it provides 70+ trace minerals that most soils are depleted of.

Our Pick

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Worm Castings (15 lb bag)

Reviewed by Ashton

Pure, screened vermicompost teeming with beneficial microbes. Top-dress, brew tea, or mix into potting soil.

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Azomite Rock Dust

Reviewed by Ashton

Volcanic trace mineral supplement with 70+ minerals. Remineralizes depleted garden soil for more nutrient-dense food.

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Our Verdict

Use both together for best results. They address different soil needs and are complementary.

Why: If you can only buy one, worm castings deliver the most immediate and visible impact — better soil structure, improved water retention, and happier plants within weeks.