University of California, Department of Agriculture and Natural resources, explains: “Worm castings are 100% organic humus. Castings contain microbiological colonies that help fight soil-borne plant diseases and repel insects. Worm castings are water-soluble, which allows plants to quickly and easily absorb essential nutrients and trace minerals. When the manure passes through the worm’s digestive tract, it forms a coating around the grain which allows for the nutrients to ‘time release’ into the soil. Nutrients are readily available to plant material over a greater length of time and will not burn even the most delicate plants. Analysis of earthworm castings reveals that they are rich in iron, sulfur, calcium, nitrogen, phosphorus and potassium (NPK rating: .5.5.3). They are much richer in nutrients than bulk compost, therefore application rates are much lower. Chemical fertilizers are a one-shot wonder. The plant uses what is immediately available – the rest leaches out into the soil beyond the plant’s reach. Chemical fertilizers are also the number-one polluter of our waterways.

Improved Growth: Extensive University testing has been performed by Ohio State, Cornell University, UC Davis and the Australian SIRO to prove the worth of worm castings. The tests have shown improved flower size, bloom quantity, quality and color. Fruit and vegetable tests have resulted in yield improvements from 57% to over 200% as well as improvement in taste and appearance. A tea can be made from the castings resulting in a 100% organic spray that improves nutrient absorption. It will NOT burn your plants. This easily-absorbed water soluble mixture can be sprayed directly onto plants for immediate absorption or applied once a month while watering.”