Details of...
Scientific Name: Sagina subulata ( vs. Arenaria verna )
Pronunciation: suh-JYE-nuh sub-you-LAY-tuh (vs. ar-en-AR-ee-uh VER-nuh)
Common Name: Irish moss, pearlwort (vs. Scotch moss, moss sandwort)
Family Name: Caryophyllaceae
Plant Type: Ground cover, Herbaceous perennial
Key ID Features: Low-growing prostrate perennial plant forming a thick, dense mat, stems < 10 cm long; leaves opposite, slender subulate (awl-shaped), to 1 cm long; flowers solitary in Irish moss or florets in cymes as in Scotch moss, 4–5 mm wide, five white petals as long as the green sepals; capsules 2.5–3 mm long, seeds triangular shaped, 0.4–0.5 mm, brown and smooth.
Course(s): HORT 1155, Level 3 Apprenticeship


Habit: Dense, Spreading
Form: Creeping / Mat-like
Texture: Fine
Mature Size:
Height:< 0.1m
Spread:0.1 - 0.3m
Growth Rate:Slow
Origin: Europe
Hardiness Rating: Zone 3: (-40 to -34 C)
Exposure: Full sun
Soil/ Growing Medium: Rocky or gravelly or dry, Well-drained
Water Use: Low
Landscape Uses: Accent plant, Alpine, Container planting, Ground cover, Rock garden, Small garden/space
Additional Info: Images are of Irish moss and S. ‘Aurea’ (yellowish leaf colour). Compare Irish moss (solitary flowers) to Scotch moss (florets arranged in cymes).
Irish moss, pearlwort  (vs. Scotch moss, moss sandwort)
 
 
Leaf Morphology: Glossary
Form: Needle-like, Simple
Arrangement: Opposite
Texture/ Venation: Soft flexible
Surfaces: Glandular hairs
Colour in Fall: Green
Leaf(let) Terms:
Shapes: Linear
Apices: Acute
Margins: Entire

 
 
Inflorescence Type: Floriferous, Flowers solitary
Flower Morphology:Flowers perfect
Number of Petals:5
Corolla Shape:Rotate/stellate
Ovary Position:Superior
Colour (petals): Showy, White
Flower Scent: None
Flower Time at Peak: May, Jun, Jul
Additional Info: Scotch moss has florets arranged in cymes

 
Fruit Type: Capsule
Fruit Colour: Brown, Green
Fruiting Time: Jul, Aug
Additional Info: Not showy

 
Bark or Stem Colour:
  


Propagation: Seed, Division - above ground parts
Plant Care:
Maintenance:Low
Pest Susceptibility: Leaf scorch, Slugs or snails,
 
Location(s):
(FEA) Field lab Equipment Area
(HPZ) Horticulture PlaZa
Location Map

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