Urban Worm Company Worm Castings — OMRI Listed, Approved for Organic Use
These worm castings from Urban Worm Company carry OMRI certification — meaning they've been independently reviewed and approved for use in certified organic production. If you're growing organically or just want the cleanest soil amendment you can buy, that certification matters.
What Makes These Castings Stand Out
OMRI Listed — approved for organic use, independently verified
Balanced fungal-to-bacterial ratio for broad soil health benefits
High humic acid content supports nutrient availability and water retention
Odorless, fine-textured, and easy to apply
Shelf life of 6+ months when stored away from UV light
How to Use Worm Castings
Top dressing: apply 1/4” to 1/2” layer around the base of plants and water in
Potting mix: blend up to 20–30% castings into your potting soil for containers and raised beds
Seed starting: mix into germination medium to support early root development
Compost tea: steep in aerated water for 24–48 hours to brew a liquid soil drench
Available in 5 lb, 10 lb, 15 lb, 30 lb, and 40 lb bags with free shipping to the lower 48.
Worm castings are a soil amendment and conditioner. Results vary by soil type, application rate, and growing conditions.
