They’re constantly decomposing and processing food scraps, leaves, and organic matter into a friable, nutrient rich substance known as castings which can be used to amend soil. The digestive system of the worm is quite interesting, and in processing organic matter, they create a product that helps bind soil particles together, increases water holding capacities and overall fertility.
The castings they leave behind are ph neutral, pathogen free and loaded with humic acid. All of these lead to excellent soil quality and help any plants thrive! Worms, in particular Red Wrigglers (Eisenia fetida) have a natural urge to eat. Their "waste" (which is not waste at all) is a beautiful product that enters as raw biomass and exits as organized fertility. Keeping worms is a passive way to increase diversity, abundance and fertility in your own life.