Due to its porosity, it can also help with water retention and aeration too. Charcoal is often used in terrariums for its ability to filter any waterthat passes through it, thus “sweetening” the substrate. Though the recipe doesn’t indicate any one particular kind, horticultural charcoal and activated charcoalare.
Kids diy bottle terrarium project with toy figure
African violet terrarium diy
Diy glass ornament terrarium