Vermicompost is same as Worm castings only difference is that it takes less days and hence chipper and less pure than the worm casting. We fed worms Dairy cow manure, dried leaves, Vegetable scraps, and non-citrus fruit waste. Rich in nitrogen,potassium, phosphorus and calcium. No side effect/Eco friendly organic fertilizer. Comparatively less pure than worm casting but more chipper than it.