Answer: Volcano rock plants are simply plants that have adapted to growing in the indentations or crevices of volcanic rock. Anthuriums are good examples; they can be planted in fast-draining soils, or will root themselves on a hunk of volcanic rock. If you have tropical plants, you can grow them in any fast draining soil (cactus mix is a good choice, or chipped bark such as is used for orchids). Best wishes with your plants!
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