Details of...
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.
Course(s): HORT 2355

Habit: Horizontal, Spreading
Form: Creeping / Mat-like
Texture: Medium
Mature Size:
Height:< 0.1m
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.
cobweb houseleek
Leaf Morphology: Glossary
Form: Simple
Arrangement: Basal, Spiraled
Texture/ Venation: Succulent
Surfaces: Branching hairs
Colour in Summer: Green, Purple
Colour in Fall: Purple, Red
Leaf(let) Terms:
Shapes: Ovate
Apices: Acute
Margins: Ciliate, Entire
Additional Info: silver threads from tips of leaves create cobweb

Inflorescence Type: Floriferous, Cyme
Flower Morphology:Flowers perfect
Number of Petals:11+
Corolla Shape:Rotate/stellate
Ovary Position:Superior
Colour (petals): Showy, Pink, Purple
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 resistant )
(ONE) Overpass North side East : in princess tree root
(PDW) PonD West
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