Vermicomposting is the process of composting green waste using various earthworms, usually red wigglers, white worms, and other earthworms to create a heterogeneous mixture of decomposing vegetable or food waste, bedding materials, and vermicast. It is easy to add nutrient-rich fertilizer to plants and gardens without sorting worms. Batch composting is the fastest and most efficient way to produce high-quality compost. Usage: Vermicompost gives seedlings a really good start in life. In pots and containers, don't use pure vermicompost.
About 25% of the growing mixture seems to be about ideal, but experiment -it might vary according to what you mix it with. You can also use vermicompost to make "compost tea" liquid fertilizer. Mix two tablespoons of vermicompost with a liter of water and let it stand for a day, shaking it occasionally, then sprinkle under the plants. One-litre drinking water bottles make good sprinklers: drill a few small-diameter holes in the lid, point and squeeze. For transplants, especially bare-root transplants, spray them with an even more dilute solution of "tea", or stand them in it for a while.
It will help to prevent transplant shock. (Liquid seaweed solution is excellent for this.) Don't let the vermicompost dry out before using it -- it loses a lot of its value and resists wetting. If you store it, don't use an airtight container. It will keep for a year or more.