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.

soil biology 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…

Inside Our Large-Scale Worm Farm at Berry Best Family Farm

By Delta Worms | May 13, 2026

As spring temperatures rise in East Contra Costa County, activity across our worm farm at Berry Best Family Farm has accelerated rapidly. What started as a small vermicomposting system has grown into a large-scale biological operation covering roughly 3,600 square feet and supporting nearly 1 ton of composting worms. This spring brought major transitions for…

Why Healthy Soil is Full of Life

By Delta Worms | March 9, 2026

Microscopic view of living soil microbes including flagellates, amoeba, and fungal hyphae at 100x magnification

Healthy soil isn’t just dirt — it’s a living ecosystem. Beneath our feet exists an entire microscopic world working quietly to support plant growth, nutrient cycling, and soil health. When people talk about “living soil,” they’re referring to soil that is rich with biological activity, especially soil microbes. The more life in the soil, the…

A Tree Blooms Without Photosynthesis (Leaves)? The Science Behind Spring Blossoms

By Delta Worms | February 20, 2026

Every spring, something remarkable happens, tree blooms without photosynthesis. Leafless trees suddenly explode into bloom. Pink cherry blossoms. White pear flowers. Red maple buds. But here’s the scientific puzzle: If there are no leaves, and no photosynthesis, where does the energy come from? The answer reveals an elegant biological system that connects last summer’s sunlight,…