Sisyrinchium californicum

RHS Plant Profile
golden-eyed grass

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Other common names

yellow Californian satin flower, yellow-eyed grass

Synonyms

Sisyrinchium boreale

Bogs Grass Like
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A semi-evergreen perennial with sword-shaped, grey-green leaves to 15cm long. In summer, broadly winged stems to 60cm tall bear a succession of star-shaped, brown-veined, bright yellow flowers. A short-lived plant but it self-seeds freely. Suitable for a bog garden or pond margin

Position

Full sun

Soil Types

Loam, Clay

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Loam Clay
Moisture
Poorly–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Iridaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Clump forming
Genus
Sisyrinchium can be annuals or rhizomatous perennials forming a clump of narrowly sword-shaped leaves with erect stems carrying solitary or clustered, star-shaped or bell-shaped flowers in spring or summer
Name Status
Correct
Plant Range
W USA

How to Grow

Cultivation

Grow in boggy conditions, or in an aquatic planting basket on a pond shelf, using loam or specialist aquatic potting soil. May have the potential to become a nuisance as seeds prolifically

Propagation

Propagate by division or seed

Suggested planting locations and garden types

  • Coastal

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free