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[APD] Soil Substrates
A question about soil substrates. I've got a basic loam and a bag of
earthworm castings (for organic material). I've seen a number of references
to adding vermiculite. I'm wondering if the vermiculite is necessary, or is
just a basic loam+castings mix sufficient. Diana Walstad talks about using
regular potting soil or garden soil, which is a mix of a bunch of stuff, but
the garden shop people suggested I not always trust premixes to not be
tainted with unwanted chemicals, etc. Also, what ratio of loam to org.
matter should there be?
Could anyone lend some advice regarding this?
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