Perlite

Perlite

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5L of perlite Perlite is used in soil mixes (including soilless mediums) to improve aeration and modify the soil substructure, keeping it loose, well-draining, and defying compaction.

The perlite can be mixed with a bit of potting soil to keep tall containers from becoming top-heavy, or the perlite can be used by itself as a bottom layer in wide oversize pots.

Roots will grow down into the perlite layer whether or not soil is mixed into it. You can also use perlite for propagation.