Worm castings are the finished vermicompost output of earthworms processing organic matter — a dense, nutrient-rich amendment that feeds soil biology, improves structure, and provides gentle slow-release nutrition without burn risk at recommended ratios. Unlike synthetic fertilisers, castings simultaneously improve microbial activity, water retention, and nutrient availability.

NPK approximately 1–0.7–1.1 with a rich micronutrient and humic acid profile. Odour-neutral. Safe for all plants including seedlings. Use at 10–20% by volume in any substrate blend or as a top-dress amendment.