Oenothera stricta 'Sulphurea'

RHS Plant Profile
evening primrose 'Sulphurea'

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evening primrose 'Sulphurea' RHS / Joanna Kossak

Synonyms

Oenothera odorata 'Sulphurea'
Oenothera odorata 'Cream'

Plants for pollinators
Herbaceous Perennial
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A short-lived , clump-forming perennial to about 75cm with narrow, bronzy-green leaves and reddish stems. Large, scented, lemon-yellow flowers open from red buds and mature to peach, from early summer to mid-autumn

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Loam Sand
Moisture
Well–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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Onagraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
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

Grow in an open position in poor to moderately fertile, well-drained soil in full sun

Propagation

Propagate by seed sown in early summer

Suggested planting locations and garden types

  • Gravel garden
  • Coastal
  • Cottage and informal garden
  • Wildflower meadow
  • Flower borders and beds

Pruning

Cut back after flowering

Pests

May be susceptible to slugs

Diseases

May be susceptible to powdery mildews and a leaf spot. May be susceptible to root rot in heavy, wet soils