Lava rocks are any form of rock created when lava or magma erupts through the earth's surface and cools. There are many types of lava rock, such as pumice, basalt, obsidian, or feather rock. These rocks are called igneous rocks and have a very glass-like composition that shatters into razor-sharp shards. Feather rock is lighter than most igneous rocks, although not as light as pumice, which almost has no weight. It is useful in landscaping as a hardscape item, feather rock planter, or simple display.
Porous forms of lava rock are relatively easy to drill or chisel into. You can make dimples or depressions or simply drill holes for smaller plants. Plants in lava rock that work well are succulents, air plants, and some grasses.
One of the easiest plants that love to grow in lava rock planters are succulents. You can make a fascinating display filled with various forms, colors, and textures by using little succulents. Sempervivum, Echeveria, Crassula, Sedum, and many others will add their appeal to the distinctive look that growing plants in volcanic rocks produce.
Succulents have shallow root bases and install easily in depressions in the rock. Use thick gloves when handling feather rock or other lava rocks. The edges are extremely sharp. Use eye protection if you are drilling or chiseling into the material.
Once you have the hole or dimple you wish, press potting soil into the bottom, and then add the succulent. Firm the soil around the plant to anchor it. Follow general plant care for the variety of succulents you installed. In colder climes, use this method to make lava rock houseplants, permanent planters with a matchless appeal.
- Succulentopedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus