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Our Black Lava Rock contains no artificial coloring. It’s non-toxic, porous, and lightweight. It’s ideal to help control moisture and improve drainage. It’s commonly use as a soil additive for Bonsai, Succulents, or other plants. Lava Rock will help prevent soil compaction and will not break down over time. Tinyroots Red Lava Rock is Ready-To-Use. It have been sifted to uniform sizes and is DUST FREE. As a registered Nursery in Massachusetts and Florida, our soils and aggregates are tested regularly to comply with agricultural regulations.