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The following recipe will make 2L of starter soil, enough to fill four Solo cups or four 4″ pots.
800ml – Potting Soil
400ml – Worm Castings
400ml – Perlite
400ml – Start Soil Conditioner
Mix these items well and add just enough water to moisten the soil. You want this soil to be moist and not wet. Grabbing a handful of soil should feel spongey and lightly hold together.