‘Living stones’, or lithops, are an intriguing group of succulents. They resemble the pebbles found in their natural habitat of Namibia and its adjoining African countries. Spineless succulents of 2-4in (5-10cm) across, they grow almost completely embedded in the soil, exposing only a pair of thick and semi-circular succulent ‘leaves’ fused together. A single, daisy-like flower appears from the slit between the leaves.
There are some 200 varieties and cultivars and, because there is such diversity in colours and patterns, collecting lithops can become a hobby.