Orostachys japonica (Maxim.) A. Berger
Cotyledon japonica (basionym), Sedum erubescens var. japonicum
Orostachys japonica is a biennial or perennial succulent, up to 4 inches (10 cm) tall, with dense rosettes that grow in clumps. The monocarpic rosettes are up to 0.4 inches (2 cm) in diameter in winter and up to 3.2 inches (8 cm) in diameter in summer. Leaves are grey-green to whitish-green, often reddish in winter, up to 3.2 inches (8 cm) long, and up to 0.6 inches (1.5 cm) wide. Flowers are small, white, and produced in late summer and fall from the center of the rosettes on up to 12 inches (30 cm) tall stems.
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, this plant can survive in fairly poor soil, so long as it is well-draining. This genera is very cold-hardy and can withstand 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. Orostachys grows actively in spring and summer.
Orostachys self-propagates through offshoots and given time, and 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 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. See more at: How to Grow and Care for Orostachys
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