A drainage layer is an important step in building a long lasting terrarium. It is the first thing you add into your glass jar and it allows the water to drain down and out of the soil.
Leca (Lightweight Expanded Clay Aggregate) is a great option for a drainage layer in your terrarium as it doesn't add much weight to your build and has excellent water retention
Size Reference: 1 Litre is enough for our largest Matthew jar (30x29cm)
