Orostachys japonica (Maxim.) A. Berger
Cotyledon japonica, Sedum erubescens var. japonicum
Orostachys japonica is a succulent plant that forms dense rosettes of grey-green to whitish-green leaves, often reddish in winter. 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 narrowly spatulate with an apical spine, up to 3.2 inches (8 cm) long and up to 0.6 inches (1.5 cm) wide.
Flowers are small and white and appear on an up to 12 inches (30 cm) tall stem that grows from the center of the rosettes in late summer and fall.
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 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 plants grow actively in spring and summer. They require some bright light and do not tolerate high humidity well.
Orostachys self-propagates through offshoots and at a given time. Thus, 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 its roots. 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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