Sempervivum montanum subsp. stiriacum (Wettst. ex Hayek) Wettst. ex Hayek
Anomalous Houseleek, Mountain Houseleek
Sempervivum montanum var. braunii, Sempervivum montanum var. stiriacum, Sempervivum stiriacum
Sempervivum montanum subsp. stiriacum is native to southwestern Austria (Styria).
Sempervivum montanum subsp. stiriacum is a small succulent that forms tight rosettes of fleshy, hairy, dull green leaves with a pointed dark red to maroon-brown tip. It is distinguished from Sempervivum montanum subsp. montanum by its slightly narrower leaves. The rosettes grow up to 2 inches (5 cm) in diameter, producing offsets on short stolons to form dense mats.
The mature rosettes bear clusters of starry purple-pink flowers on erect, scaly-leaved stalks in summer. The flowers have conspicuous white highlights. Rosettes die after flowering.
USDA hardiness zones 4a to 9b: from −30 °F (−34.4 °C) to 30 °F (−1.1 °C).
How to Grow and Care
Sempervivums are not difficult to grow, provided they are not waterlogged and killed from excess watering. They can be easily grown outdoors and in containers, and they earned the name "Houseleeks" from their tendency to root on the roofs of houses. After the mother plant flowers, it will naturally die, but the plant has likely produced many offsets that will continue to grow by this time. These are excellent for cold windows. Sempervivum earned their popular name, "Hen and Chicks," from their growth habit. The mother plant, or hen, sends off numerous offsets, clustering around her base like chicks. These offsets can be easily repotted, or the plants can be left to form a clumping mat.
Repot as needed, preferably during the warm season. To repot a succulent, ensure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, removing any rotted or dead roots. Treat any cuts with a fungicide. Place the plant in its new pot and backfill it with potting soil, spreading the roots out as you repot. Leave the plant dry for a week or so, then begin to water lightly to reduce the risk of root rot.
Learn more at How to Grow and Care for Sempervivum.
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