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Diy Potting Soil With Worm Castings. Perlite is expanded volcanic glass and adds air. Finely sieved compost or worm castings, or a mix.
It is also much easier to just make one batch of mix for all my planting needs instead of making two different mixes! ½ cup or 1 cup of worm castings (or humus) if you have your own worm farm, you can add this humus to your mix. Other sources say it will sink to the bottom in a mix and block drainage, and it probably will.
The compost and worm castings will feed the plant at the right time.
His recipe is very simple, and. Mix the castings into the potting soil. Worms sell at $1 a dozen during fishing season. Other sources say it will sink to the bottom in a mix and block drainage, and it probably will.