Perlite is a natural and non-toxic expanded volcanic glass that is lightweight and a micro-porous medium.

Perlite can be mixed into compost or soil to improve drainage and root aeration, stimulates root development and vigorous growth and retains moisture. Perlite also helps prevent soil compaction.

Caution should be taken to avoid inhalation of perlite particles when handling, the use of a mask is strongly encouraged.