Perlite
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Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding wh
Expanded horticultural perlite
Perlite boulders with fireweed in foreground
Perlite mine in Owens Valley, California.
Perlite mixed into potting compost
Expanded clay aggregate
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Expanded clay or lightweight expanded clay aggregate is a lightweight aggregate made by heating clay to around 1,200 °C in a rotary kiln. The heating process causes gases trapped in the clay to expand
Heat-expanded lightweight pebbles
Root ball of a hydroponically-grown cannabis plant with aggregate embedded in it
Cleaned root ball and main stem sitting atop the total amount of aggregate used to grow a single plant
LECA can be easily used for plant-growing substrate.