Sempervivum tectorum

Common names: Common Houseleek, Roof Houseleek
Family: Crassulaceae

Sempervivum tectorum is a hardy succulent native to the mountainous regions of Europe, including the Alps and Carpathians. It is well known for its ability to grow on rooftops and rocky outcrops, where it forms dense, attractive rosettes.

Origin and Habitat

This species naturally grows in alpine and subalpine zones on rocky slopes, walls, and old roofs. It thrives in well-drained, gritty soils and tolerates cold winters, often surviving frost and snow. The climate of its native habitat includes cool summers and cold winters with moderate rainfall.

Plant Description

Sempervivum tectorum forms tight, symmetrical rosettes of fleshy, pointed leaves that are usually green with reddish or purplish tips, especially when exposed to strong sunlight or cold temperatures. The leaves are covered with a fine, waxy coating that helps reduce water loss. In summer, the plant produces star-shaped pink to red flowers on tall stalks, after which the rosette typically dies, but offsets continue to grow.

Care Instructions

Light
Prefers full sun to partial shade. It requires plenty of sunlight to maintain its compact shape and vibrant leaf coloration.

Watering
Water sparingly, allowing the soil to dry out completely between waterings. It is drought-tolerant and prone to rot if overwatered.

Soil
Use a very well-draining soil mix, such as a gritty or sandy cactus mix.

Temperature
Very cold-hardy, tolerating temperatures well below freezing. Ideal growth occurs between 10°C and 24°C.

Additional Information

Sempervivum tectorum is easy to propagate from offsets, which form dense mats over time. It is popular in rock gardens, green roofs, and container plantings for its resilience and decorative rosettes. The plant’s traditional use includes placing it on roofs to protect against lightning and fires.