Worm castings are an organic soil amendment made from the digested material produced by earthworms, commonly used to improve soil health, fertility, and microbial activity.
What Are Worm Castings?
Worm castings, also known as vermicompost, are the end product of worms breaking down organic matter. The result is a nutrient-rich, biologically active material that improves soil structure and nutrient availability.
How Are Worm Castings Used?
Worm castings can be:
- Mixed directly into soil blends
- Used as a topdress in containers or beds
- Brewed into compost teas
- Added to living soil systems
They are commonly used in organic and living soil grows.
Why They Matter
Worm castings help:
- Improve nutrient uptake
- Support beneficial microbes
- Increase soil moisture retention
- Buffer against nutrient burn
Because nutrients are released slowly, they are considered very forgiving for beginner growers.
Limitations & Notes
Worm castings are not a complete fertilizer on their own. While they support plant health, they are typically used alongside other amendments or top dressings to meet full nutrient demands during flowering.
Resources
- ARTICLE: How To Start A Worm Bin – Jeff Chasser (The Soil Makers)
- PODCAST: Wiggly Warriors W/ Robbie From Missouri Worm Supply – The Circle (Your Average Grow)
- PODCAST: Check On Your Worms – The Reverend Pirate Frog (Your Average Grow)
Gear We Use
Note: Some links may be affiliate links that help support the site at no extra cost to you.
- BuildASoil Worm Castings (BuildASoil)
Get 5% Off With Code ‘GNC5’ - Colorado Worm Company Premium Worm Castings (BuildASoil)
Get 5% Off With Code ‘GNC5’ - Elite Worm Castings (The Soil Makers)