Orostachys spinosa (L.) Sweet
Chinese Dunce Cap, Dunce Cap, Dunce's Caps, Spiny Dunce's Cap, Spiny Pennywort
Cotyledon spinosa (basionym), Cotyledon erubescens, Crassula spinosa, Orostachys erubescens, Sedum erubescens, Sedum spinosum, Umbilicus erubescens, Umbilicus spinosus
Orostachys spinosa is a small, very slow-growing succulent that forms globose rosettes of fleshy, grey-green leaves with white, soft spiny tips. The rosettes grow up to 4 inches (10 cm) in diameter. Leaves are arranged in a symmetrical, crowded pattern around the rosettes. Racemes of small, insignificant, greenish-yellow flowers are produced from the rosettes' center on up to 12 inches (30 cm) tall stems. This succulent is monocarpic, and the individual rosette dies once it flowers, but new offset rosettes are usually developed first.
USDA hardiness zones 4a to 8b: from −30 °F (−34.4 °C) to 20 °F (−6.7 °C).
How to Grow and Care
As with most similar genera of the Crassulaceae family, this plant can survive in fairly poor soil, so long as it is well-draining. This genera is very cold-hardy and can survive temperatures to -30 °F (-34 °C). Allow soil to dry to the touch between waterings and avoid getting water on the rosettes. Orostachys actively in spring and summer. It requires some bright light and does not tolerate high humidity well.
Orostachys self-propagates through offshoots, and at a given time, one plant will form a dense mat of many. Propagation is primarily through offset separation.
To separate an offset, remove soil from the offset's base to find the stolon (thick root which attaches the pup to the mother plant). It is best to use an offset that has already established some roots of its own. Cut the stolon close to the pup (to discourage roots growing from the stolon). Place the offset into a small pot with well-draining, sandy soil. Do not water until new growth is noted.
Learn more at How to Grow and Care for Orostachys.
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