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Orostachys japonica (Rock Pine)

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Scientific Name

Orostachys japonica (Maxim.) A. Berger

Common Names

Rock Pine

Synonyms

Cotyledon japonica, Sedum erubescens var. japonicum

Scientific Classification

Family: Crassulaceae
Subfamily: Sedoideae
Tribe: Sedeae
Subtribe: Umbilicinae
Genus: Orostachys

Description

Orostachys japonica is a biennial or perennial succulent 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 appear in late summer and fall from the rosettes' center on up to 12 inches (30 cm) tall stems.

Orostachys japonica - Rock Pine

Photo via flickr.com

Hardiness

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 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.

Origin

Native to China, Japan, and Korea.

Links

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