Worm castings are definitely the digested “soil” produced by worm farming or vermicomposting. They offer some macronutrients for leaf advancement; In such a case, its NPK ratio is one-0-0. But they also contain micronutrients and beneficial microbes, and improve drainage and soil structure. This fertilizer comes in a granular type. https://fertilizersuppliersinnami24578.suomiblog.com/nano-fertilizer-for-sale-for-dummies-45063251