Sempervivum tectorum

Tracheophyta MagnoliopsidaCrassulaceaeSempervivumSempervivum tectorum

Ecology

A long-lived, evergreen perennial, planted and more or less naturalised on tiled and thatched roofs, old walls, gate pillars and porches, and in churchyards. It is also occasionally found on stabilised sand dunes. Lowland.

Status

Neophyte

World Distribution

Native of the mountains of C. & S. Europe.

Broad Habitats

Light (Ellenberg): 8

Moisture (Ellenberg): 2

Reaction (Ellenberg): 4

Nitrogen (Ellenberg): 1

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 15.3

Annual Precipitation (mm): 871

Height (cm): 40

Perennation - primary

Perennial

Life Form - primary

Chamaephyte

Comment on Life Form

Definitely a chamaephyte - height is flowering-stem height; the overwintering bits are down below

Woodiness

Herbaceous

Clonality - primary

Shortly creeping, stolons in illuminated medium

Count of 10km squares in Great Britain: 500

Count of 10km squares in Ireland: 42

Count of 10km squares in the Channel Isles: 2

Weighted Changed Factor: 43

Weighted Change Factor Confidence (90%)

48

JNCC Designations

NBNSYS0000003485

Atlas text references

French CN, Murphy RJ, Atkinson MGC
1999.  Flora of Cornwall.
Grigson G
1955.  The Englishman's Flora.
Jalas & Suominen (1999)
Le Sueur F
1984.  Flora of Jersey.