How to use worm castings in a soil mix?
Worm castings can be used in a multitude of ways – mixed into a soil mix, a soilless mix, or as a tea or slurry. Usually worm castings is thought of as an additive. Recommendationsvary wildly, but I would recommend adding one tenth to one fifth in anyorganic mix (10-20%). Top dressing with worm castings would work well, too, especiallywith indoor containers. Making a worm castings tea by steeping thecastings in clean well aerated water makes for a life givingplant-nutrient. I recommend filtering worm tea before use and returningthe dregs into the worm bin after a couple of rounds. One can use plain worm castings as a growing medium, and in myexperience it works very well. But usually finished worm castings tendsto be mud-like in consistency, and needs something to aerate andlighten up the texture. Perlite and expanded clay work very well forthis. 50% of expanded clay (multiple size) and 50% worm castings makesfor a nice quick-n-dirty primo soil(less) mix.
