When vermiculite is heated to very high temperatures, it expands into long strands resembling small worms. Vermiculite is lightweight, non-toxic and sterile and does not deteriorate over time. It has a neutral pH. It also attracts various plant nutrients such as potassium, magnesium and calcium. These qualities make it useful for propagation and for potting up plants that do best in moist compost, including houseplants.
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