Conophytum calculus (A. Berger) N. E. Br.
Marble Buttons, Cone Plants, Dumplings, Button Plants, Living Pebbles
Mesembryanthemum calculus (basionym), Conophytum calculus var. calculus, Conophytum komkansicum
Conophytum calculus is a small, stemless succulent with individual rounded bodies that multiply with age and cluster together to form dense clumps. Leaves are fused into one spherical body up to 1.2 inches (3 cm) in diameter. They are completely smooth and hairless, chalky-green to pale yellowish-green, always without any spot. New leaves are formed inside the existing ones, and when, after a year, the leaf body starts to die, a new one emerges from inside. The old leaf becomes a thin, dry, and smooth, beige-colored sheath, sometimes turning black, which persists on the plant. It flowers in fall and has spicy, clove-scented, golden yellow to dark orange, nocturnal flowers.
USDA hardiness zones 10b to 11b: from 35 °F (+1.7 °C) to 50 °F (+10 °C).
How to Grow and Care
Conophytums are usually grown in dish gardens where they spread slowly but make good ornamental plants for window gardening. They also do well in rockeries where they can be grown in crevices.
These plants vegetate during the winter season. They must then be kept dry during hot, gradually wet upon fall arrival. The moisture stimulates the release of new root hairs, and the plant will grow for the entire winter season, foliar issuing new pairs from inside the existing ones. Flowering usually occurs in the fall, and the color of the flowers is extremely variable from species to species. The cultivation is quite easy, but care must be taken to avoid excess water and to prevent rot. The plants themselves communicate their water needs with a slight wrinkling of the epidermis. They do not particularly fear the cold weather and can also resist temperatures of 23 °F (-5 °C) as long as the soil is dry, and the temperature returns rapidly to rise.
Learn more at How to Grow and Care for Conophytum.
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