Perlites
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Appearing as tiny, roundish, white specks amid the other components, perlites in potting soil is a non-organic additive used to aerate the media and modify the soil substructure. This keeps it loose, well-draining and defying compaction.
A premium mix of one part loam, one part peat moss, and one part perlite is optimum for container growing, enabling the pot to hold just enough water and oxygen.