Worm castings

Worm castings are nutrient-rich excretions from earthworms, commonly used to enhance soil and plant growth.

Also called / Category

Also called vermicast or worm manure, under Environment, Media & Nutrition.

Key takeaways

• Worm castings improve soil structure and fertility.
• They contain offset-4 transition-colors hover:underline" title="Learn more about Beneficial microbes">beneficial microbes and nutrients.
• Used in organic farming and cannabis cultivation.
• Non-toxic and odourless, making them user-friendly.
• Enhance plant growth and yield.

What it is / How it shows up

Worm castings are often mentioned in gardening guides, product labels, and growth media descriptions. They are created as earthworms digest organic matter, resulting in a rich, dark substance known for its excellent nutrient profile. This natural fertilizer is particularly valued in cannabis cultivation for its ability to improve soil aeration and water retention, making plants healthier and more robust. Worm castings are odourless and can be mixed directly into soil or used in compost teas to enhance plant growth.

How it’s measured or identified

• Measured by volume or weight in gardening products.
• Identified by its dark, crumbly texture and earthy smell.
• Often listed as an ingredient in soil amendments.

Use in context

• “Add worm castings to your soil mix for improved cannabis plant health.”
• “Vermicast boosts the microbial activity in organic gardens.”
• “Use worm manure in your compost tea for enhanced nutrient delivery.”

Safety & compliance in Canada

• Regarded as a safe and natural soil amendment.
• Widely accepted in organic certification processes.
• No restrictions on usage in personal or commercial cultivation.

Related terms / See also

• Aeroponics
• Beneficial microbes
• Apical meristem
• Aphids
• Aroma profile

FAQs

What are worm castings?
Worm castings are the waste produced by earthworms, rich in nutrients and beneficial microbes, used to improve soil health and plant growth.

How do I use worm castings?
Mix them into the soil or use them in compost tea to enhance plant growth by providing essential nutrients and improving soil structure.

Are worm castings safe for cannabis plants?
Yes, they are safe and beneficial for cannabis cultivation, enhancing growth and yield without harmful chemicals.

Sources

• Health Canada
• PubChem
• Canadian Organic Standards