Oyster Shell Flour

Oyster shell flour is a finely ground calcium and grit supplement for composting worm bins. It complements worm food and bedding rather than replacing them.

Pack sizes

Available in 1, 5, and 10 pound bags.

How to use

The supplier recommends sprinkling 1–2 tablespoons over the bedding every 2–4 weeks, adjusted for bin size and feeding. Gently mix into the top bedding layer. Follow the package directions for your setup.

Use alongside Big J's Organic Worm Chow. Find more worm food and care supplies.

Shipping & orders

Ships directly from our supplier, Utah Worm Company, and may arrive separately from blackworms or other products. Available delivery options and charges are shown at checkout. See our shipping information or contact Blackworm Supply with order questions.