Scientific Name:
Sempervivum arachnoideum
ssp.
tomentosum
Pronunciation:
sem-pur-VYE-vum uh-rack-no-EYE-dee-um
Common Name:
cobweb houseleek
Family Name:
Crassulaceae
Plant Type:
Broadleaf evergreen, Ground cover, Succulent or Cacti
Key ID Features:
Leaves arranged in a cob web-like covering of rosettes.
Habit:
Horizontal, Spreading
Form:
Creeping / Mat-like
Texture:
Medium
Mature Height:
< 0.1m
Mature Spread:
0.1 - 0.3m
Growth Rate:
Slow
Origin:
Europe
Hardiness Rating:
Zone 5: (-29 to -23 °C)
Exposure:
Full sun, Sheltered
Soil/Growing Medium:
Rocky or gravelly or dry, Well-drained
Water Use:
Low, Summer dry
Landscape Uses:
Alpine, Container planting, Green roof technology, Ground cover, Perennial border, Rock garden, Summer interest
Additional Info:
Google. Compare to S. leucanthum.
Leaf Morphology:
Form:
Simple
Arrangement:
Spiraled, Basal
Texture/Venation:
Succulent
Surfaces:
Branching hairs
Colour in Summer:
Green, Purple
Colour in Fall:
Purple, Red
Shapes:
Ovate
Apices:
Acute
Margins:
Ciliate, Entire
Additional Info:
silver threads from tips of leaves create cobweb
Inflorescence Type:
Cyme, Floriferous
Flower Morphology:
Flowers perfect
Number Of Petals:
11+
Corolla Shape:
Rotate/stellate
Ovary Position:
Superior
Colour (petals):
Showy, Purple, Pink
Flower Scent:
None
Flower Time at Peak:
Jul, Aug, Sep
Additional Info:
Flower image credit: George Marien
Fruit Type:
Follicle
Fruit Colour:
Brown
Fruiting Time:
Sep, Oct
Additional Info:
Not showy,
Bark or Stem Colour:
Organ Modifications:
Succulent leaves
Propagation:
Division - above ground parts
Pest Susceptibility:
Crown rot, Rust (Pest resistant, Disease resistant, Drought tolerant)
Course(s):
- HORT 2355
Location(s):
- (ONE) Overpass North side East : in princess tree root
- (PDW) PonD West