Leftwood said:... I'll put a quarter inch layer of almost pure regular potting mix at the bottom of the pot for two reasons: 1) to prevent the excessively sandy soil from falling through the holes... Depending on the seed, I use a surface grit layer of grit, on up to a cm deep.
Leftwood said:...with more moisture retentive mixes I would sometimes get seed germinating at the edges of the pot, rather than all over the surface. This I attribute to the faster drying of the medium at the periphery.
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