Gro4 - Earthworm Castings

Gro4 Earthworm Castings provide highly concentrated, easily absorbed nutrients. They are rich in nitrogen, phosphorus, potassium, calcium and magnesium.


Soil organisms play an incredibly important role in soil structure. Gro4 premium Earthworm Castings contain a multitude of these organisms that include beneficial bacteria, protozoa, nematodes, fungi and so much more. In a healthy soil ecosystem, soil organisms work together to transform and maximize available nutrients to be used as food for plants. Gro4 earthworm castings help sustain an active and balanced soil structure.

Gro4 Earthworm Castings are an approved input for organic agriculture.

Promote plant growth and root structure • Contain high microbial organic matter • Improve soil drainage, structure and aeration


Fertilizer/Lime Analysis
Parameter Analysis Result Detection Limit Method Reference
Nitrogen (Total) 2.10 0.05 ENV-G-003-6
Phosphorus (Available P205) 3.22 0.10 ENV-G-003-6
Potassium (Soluble K20) 1.31 0.05 ENV-G-003-6