Two to three months after you start your vermicompost, you’ll notice a few inches of worm castings ready for harvesting. The brown, earthy-looking, soil-like material at the bottom of your bin is the finished compost your worms made.
You might think that harvesting vermicompost from a home bin can be challenging, especially if you think about how you’re going to separate the finished compost from the remaining bedding and/or food, and the worms themselves.
There are a few different tricks you can use to harvest your vermicompost.
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Manual harvesting of worm castings is when you want to collect only small amounts of vermicast a few days after the compost pile is stocked with worms. The pile may not be fully decomposed yet, but, you can get some of what has been.
According to Wikipedia: Vermicast (also called worm castings, worm humus, worm manure, or worm feces) is the end-product of the breakdown of organic matter by earthworms. These castings have been shown to contain reduced levels of contaminants and a higher saturation of nutrients than the organic materials before vermicomposting.[
This method is simple: Gather the vermicast by hand or with a trowel then transfer it directly in a container.
During this process, you might need to pick out a few worms individually and return them to the compost bin.