Black Lava (Scoria) The Foundation of Strength and Drainage Achieve the perfect balance of aeration and stability with our Professional-Grade Horticultural Black Lava. Sourced from ancient volcanic deposits, this porous igneous rock is a staple in high-performance bonsai soil mixes. Unlike standard gravel, our black lava is functionally designed to trap air while allowing excess water to pass through instantly, preventing root rot and promoting vigorous "fine" root growth. Why Choose Black Lava? Superior Aeration: The irregular, honeycombed surface of each granule creates thousands of tiny air pockets, ensuring your roots never "suffocate" in compacted soil. Structural Stability: High density and weight provide an excellent "anchor" for top-heavy trees, preventing them from shifting in the potessential for the development of a healthy nebari (root flare). Thermal Regulation: The dark, matte finish of Black Lava absorbs and retains ambient heat, keeping root temperatures consistent during cooler months. Inorganic & Permanent: Unlike organic bark, Black Lava will never break down, crush, or decompose. It maintains its structure for years, reducing the frequency of repotting. How to use Black Lava: Bonsai Mixes: For the ultimate "Conifer Mix," combine Black Lava with Akadama and Kiryuzunain a 1:1:1 ratio. The lava provides the drainage, while the akadama holds the nutrients.