Oyster Shell Flour for Composting Worms

Give your worms the minerals they need to thrive with our premium Oyster Shell Flour! Finely ground oyster shells provide a natural source of calcium while helping maintain a healthy worm bin environment.

Why Add Oyster Shell Flour?

🪱 Supports Healthy Worms – Calcium is an essential mineral that helps composting worms maintain normal biological functions and overall health.

🌱 Aids Digestion – Composting worms use tiny grit particles in their gizzard to help break down food. Oyster shell flour provides a fine, natural grit that can improve digestion and the efficiency of breaking down organic matter.

⚖️ Helps Buffer pH – As food scraps decompose, they can create acidic conditions in your worm bin. Oyster shell flour helps neutralize excess acidity, creating a more stable environment for your worms while reducing the risk of odor and pest issues.

🥚 Supports Cocoon Production – Calcium is an important mineral for healthy worm reproduction and may help support consistent cocoon production in a well-maintained worm bin.

How to Use

Simply sprinkle 1–2 tablespoons of oyster shell flour over the surface of your worm bin every 2–4 weeks, depending on the size of your bin and the amount of food being added. Gently mix it into the top layer of bedding or leave it on the surface before feeding.

For larger worm farms, apply as needed to help maintain proper mineral levels and a balanced pH.

Perfect For

• Red Wigglers (Eisenia fetida)
• European Nightcrawlers
• African Nightcrawlers
• Indoor and outdoor worm bins
• Vermicomposting systems of all sizes

Pro Tip: Oyster shell flour is a supplement—not a food source. For best results, use it alongside a balanced diet of fruit and vegetable scraps and quality bedding.

At Utah Worm Company, we use products we trust to help create healthy, productive worm bins. Whether you're just getting started or managing a thriving worm farm, oyster shell flour is a simple addition that can make a big difference.