Black lava rock is a lightweight, porous volcanic stone with a dark, charcoal-black color. It’s both functional and visually striking in terrariums and bioactive setups.

In terrariums, black lava rock is used for:

• Drainage: Perfect as a base layer to prevent waterlogging

• Structure: Great for building natural-looking terrain and anchoring plants or moss

• Contrast: Its dark color makes green foliage and moss pop

Like red lava rock, its porous surface supports beneficial microbes, making it ideal for bioactive environments. It's durable, doesn't alter pH, and adds a bold, earthy feel to any terrarium design.