Oenothera speciosa 'Siskiyou'

RHS Plant Profile
white evening primrose 'Siskiyou'

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white evening primrose 'Siskiyou' RHS / Joanna Kossak
white evening primrose 'Siskiyou' RHS

Synonyms

Oenothera berlandieri 'Siskiyou'
Oenothera pallida 'Siskiyou'
Oenothera rosea 'Siskiyou'
Oenothera 'Siskiyou'
Oenothera 'Siskiyou Pink'

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Herbaceous Perennial
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A low-growing, spreading perennial to around 50cm tall forming dense mats covered with lance-shaped, toothed leaves. Fragrant, saucer-shaped, dark-veined, dark pink flowers are borne from summer into autumn

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or East–facing or West–facing
Exposure
Exposed or 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)
H5
Drought Resistance
Yes

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Onagraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Matforming
Genus
Oenothera can be annuals, biennials or perennials, upright or spreading in habit, with simple or lobed leaves and bowl-shaped, white, yellow or pink flowers over a long period in summer
Name Status
Accepted

How to Grow

Cultivation

Grows well in average to rich, well-drained soil in full sun or light shade

Propagation

Propagate by division in early spring, or by softwood cuttings of unflowered shoots from late spring to midsummer

Suggested planting locations and garden types

  • Cottage and informal garden
  • Gravel garden
  • Prairie planting
  • Coastal
  • Wildlife gardens
  • Ground cover

Pruning

No pruning required but can be cut back after flowering to encourage new growth and flowers

Pests

May be susceptible to slugs and aphids

Diseases

May be susceptible to leaf spot, powdery mildews and downy mildews; root rot may be a problem in rich, wet, heavy soil but generally disease-free