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.

Community, Gardening, and Events

Things to Do in Brentwood, CA on Saturdays: Visit DIG’s Garden

By Delta Worms | March 27, 2026

Looking for things to do in Brentwood, CA on a Saturday morning that are relaxing, local, and meaningful? DIG’s GardenDIG’s Garden is part of the local gardening movement supported by organizations like the and other community-based initiatives. Skip the usual routine and spend a couple of hours at DIG’s Garden, one of Brentwood’s most unique…

5 Reasons to Join Delta Informal Gardeners (DIGs)

By Delta Worms | February 11, 2026

If you’re looking for a welcoming gardening club, Delta Informal Gardeners (DIGs) offers community, education, and one of the most popular plant sales in the area. Whether you’re new to gardening or have years of experience, DIGs connects you with local gardeners who share knowledge, plants, and inspiration throughout the year. In fact, many members say…

What Is Delta Informal Gardeners (DIG)?

By Delta Worms | July 12, 2025

Delta Informal Gardeners (DIG) is a local community of gardeners, plant enthusiasts, and soil lovers who gather to share knowledge, plants, and inspiration throughout the year. Based in East Contra Costa County, DIG brings together beginners and experienced growers alike to exchange ideas, learn what truly thrives in our local climate, and build lasting connections…

Meet Chris & Robin Choate of Delta Worms

By Delta Worms | June 22, 2025

Chris and Robin Choate take years of engineering and gardening experience and use them to regenerate local soil through vermicomposting and community education. Meet Chris — Solid Waste Industry Leader & Sustainability Advocate After a 40-year career in the solid waste and recycling industry, Chris Choate decided it was time to dig deeper—literally. As a…

🌱 Vermicompost Comes to Berry Best Family Farm!

By Delta Worms | November 25, 2024

Introduction At Berry Best Family Farm, just outside the Delta’s heartland, the team was ready for a change, vermicompost. They wanted richer soil, stronger yields, and a regenerative approach that would carry the land forward. That’s when they teamed up with Delta Worms—experts in composting worms and vermiculture—to bring a new layer of life to…