Bioscape Ebony Black Coarse 2-4mm 3kg Bag

The Bioscape Terra Base is a volcanic material that houses bacteria, allows drainage/water circulation, and has a mineral content.

It can be used as a base drainage layer in terrariums - adding mineral benefit as plant roots reach it. You can also add it to terrarium substrate to keep the mix "open" and add some mineral content. And finally, it makes a great decorative addition that will not affect soil pH