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Sponge rock, also known as Perlite, is a common ingredient in orchid mixes. Sponge rock increases aeration and retains moisture. It is the volcanic glass that expands when heated and becomes very porous.

Perlite Lightweight Soil Conditioner/Sponge Rock Grade 3 - 21 Lbs more details.. Price: $20.50	Perlite Lightweight Soil Conditioner/Sponge Rock Grade 3 - 3 Lb Zip bag more details.. Price: $5.00	Perlite Lightweight Soil Conditioner/Sponge Rock Grade 4 - 19 Lb s more details.. Price: $20.50
Perlite Lightweight Soil Conditioner/Sponge Rock Grade 4 - 3 Lb Zip bag more details.. Price: $5.00