How much worm castings should I use?

For most garden beds, incorporate worm castings at 5–20% by volume into the top few inches of soil. For container plants, mix 10–25% into potting soil. Smaller amounts can be applied as a top dressing during the growing season.

Can worm castings burn plants?

No. Properly matured worm castings are low in soluble salts and release nutrients gradually, making them safe for seedlings, transplants, and established plants.

Are worm castings better than compost?

Worm castings are often more biologically concentrated than traditional compost, typically containing higher microbial activity and more plant-available nutrients.

Do worm castings replace fertilizer?

Worm castings improve soil biology and nutrient availability. They may reduce reliance on synthetic fertilizers but are commonly integrated into a broader soil fertility program.

regenerative agriculture Archives

Healthy Soil Practices for Sustainable Farming | Family Harvest Farm

By Delta Worms | May 15, 2026

By Mary Cherry | Guest Contributor Healthy soil practices are the foundation of every successful farm. At Family Harvest Farm, we believe strong crops begin underground — with living soil rich in organic matter, beneficial microbes, and natural biology. Our farm was built around the idea that sustainable farming starts by caring for the soil…

Alternative Technologies to Urban Waste Composting

By Delta Worms | October 21, 2025

Exploring innovative ways to turn Urban Waste Composting into soil health and clean energy Urban composting produces enormous amounts of organic waste every day — from kitchen scraps to landscaping debris. Traditionally, composting has been the most accessible way to recycle that material into something beneficial for the soil. However, new alternative technologies to urban waste…

The Delta Worms Story

By Delta Worms | July 13, 2025

The Delta Worms Story began with a simple idea: to rebuild soil from the ground up—literally. Born out of East Contra Costa County’s rich agricultural history, Delta Worms started as a backyard experiment in composting kitchen scraps and garden waste. What began as a few trays of red wigglers turned into a full-fledged mission: transforming waste into…

Where to get DW Vermicompost – East Contra Costa County

By Delta Worms | July 3, 2025

Hey East Contra Costa County gardeners here’s where to get DW Vermicompost, locally. If you’ve been searching for local, high-quality vermicompost (worm castings) to supercharge your vegetable beds, flower gardens, or orchard soil — your search ends today. Because the rich soil behind our community’s thriving gardens has a secret ingredient… and it’s right here.…