TOYPOPOR Black Sparkling Fireplace/Fire Pit/Craft Art Sand Black Galaxy, for Terrarium, Fairy Gardening, Top Dressing, 2.2lb

Mix Horticultural Lava is commonly used in bonsai as an additive to soils.While lava would be a pretty good medium to promote tree growth by itself as it drains very well and retains a large amount of moisture, it is best to use it in a mix.Black lava will also help prevent soil compaction in your mix and give it some structure.'