Re: Do not use Scott's potting soil
From a local Ag supplier you can obtain 4 cu.ft. compressed bales of "Plug Mix". You'll find that per square foot it is less expensive than any "soil" at a big box store and just the right stuff for growing out TC's or plugs in 4 inch pots.
Alternately, you can make your own:
2 parts thoroughly cooked sifted compost or ground sphagnum peat
1 part fine grain perlite or vermiculite
1 part worm castings
1 part 1-2mm washed, untreated sand
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