Worm castings contain a high level of nitrogen, which is an essential nutrient for plant growth and development. Many castings that are purchased in airtight bags, are usually void of active soil microbes and or nitrogen. There are however a FEW reputable, experienced and stable companies, that have active or dormant microbes in their castings, no matter how they are packaged. Light of the Soil has teamed with local, worm ranch operators that have proven harvesting and packaging practices.
Worm castings also contain phosphorus, which is an important nutrient that is necessary for plant growth & development, particularly in the early stages.
Energy transfer: Phosphorus is a key component of adenosine triphosphate (ATP), which is the molecule that stores and transfers energy within cells. ATP is essential for many processes in plants, including photosynthesis, respiration, and cell division.  Flower & fruit production: Phosphorus is important for the development of flowers & fruit.
Bacteria (keep in mind that there are good bacteria all around us!)
Bacteria in soil can be classified into groups based on their characteristics. Some of the bacterial groups found in soil include:
Decomposers: Break down dead organic matter back into the soil.
Nitrogen fixers: Convert atmospheric nitrogen into forms that plants can use.
Denitrifiers: Convert nitrate & nitrite back into atmospheric nitrogen.
Plant growth-promoting bacteria: Produce hormones that help plants grow & resist disease.
Pathogenic bacteria: Can cause diseases in plants, animals, & humans.
Worm castings do contain some amounts potassium. Potassium is one of the essential nutrients found in worm castings, along with other beneficial nutrients. These nutrients are derived from the organic matter that worms consume and break down during the vermicomposting process.
Potassium is an important macronutrient for plant growth and plays a crucial role in various physiological processes in plants, such as enzyme activation, photosynthesis, and water uptake.

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