Soil-based Potting Medium


From sciencefriday.com:

1 part compost or leaf mould (use only mature compost, passed through ½ inch screen)
1 part garden topsoil (light, loamy topsoil, sterilised)
1 part coarse builder’s sand
1 tsp lime or dolomite lime per gallon
½ c worm castings per gallon (or use balanced fertiliser per recommended rates, usually about 3 tbsp per gallon)

Mix ingredients thoroughly.  Wet the mixture before using, until it has the damp feel of a wrung-out sponge.

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