Worm Castings (Vermicompost): Complete Guide
Earthworm-processed organic matter packed with beneficial microbes, humic acids, and plant-available nutrients in a 2-1-1 ratio. Virtually impossible to burn even on delicate seedlings, making it the safest potting amendment available. Mix 10-20% into container soil or topdress houseplants with 1/4 inch. Expensive at roughly $1.50 per pound, so use regular compost for large garden beds instead.
Key Facts
2N
1P
1K
N 2% Nitrogen: leaf and stem growth
P 1% Phosphorus: roots and flowers
K 1% Potassium: health and disease resistance
Learn more about NPKNPK Ratio
2N
1P
1K
N 2% Nitrogen: leaf and stem growth
P 1% Phosphorus: roots and flowers
K 1% Potassium: health and disease resistance
Learn more about NPKFormgranular
Application Rate1/4 inch topdress or mix 10-20% into potting soil
Price~$1.5/lb est.
Release Speedslow
Burn Riskvery low
Low Risk: Safe application rate for most plants.
What is Worm Castings (Vermicompost) Best For?
When Should You Use Worm Castings (Vermicompost)?
Use in seed starting mixes, as a houseplant topdress, or mixed into container potting soil.
When Should You NOT Use Worm Castings (Vermicompost)?
Expensive for large-scale garden applications. Use regular compost instead.
Source:Oregon State Extension