Worm Castings 2L
Worm castings are best described as a biological care package, bringing a lot of organisms to the soil. These organisms hold plant nutrients inside the structures of their bodies. As they excrete or die, nutrients are delivered to the surrounding soil particles, and hungry plants' roots will take them in. When higher level decomposers make meals out of other organisms, nature has set things up so that up there is plenty of nitrogen rich waste product that plants use.