Orostachys spinosa (L.) Sweet
Dunce's Caps, Dunce Cap, Chinese Dunce 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 with low, spiny, grey, globose rosette up to 4 inches (10 cm) across at maturity. The grey-green, fleshy leaves with white, soft, spiny tips, are arranged in a symmetrical crowded pattern around the rosettes. Racemes of small, insignificant, greenish-yellow flowers are produced on short stems up to 12 inches (30 cm) tall, from the center of the rosettes. It is monocarpic and the individual rosette dies once it flowers, but new offset rosettes are usually developed first.
USDA hardiness zone 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 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 requires some bright light. This plant doesn't tolerate high humidity well. It grows actively in spring and summer.
Orostachys self-propagates through offshoots and 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 base of the offset to find the stolon (thick root which attaches the pup to the mother plant). It is best to use an offset which 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… – See more at: How to Grow and Care for Orostachys
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