Oenothera fruticosa subsp. glauca

RHS Plant Profile

glaucous evening primrose

RHS

Synonyms

Oenothera tetragona 'Sundrops'
Oenothera fruticosa subsp. glauca 'Sundrops'
Oenothera tetragona var. fraseri
Oenothera cinaeus
Oenothera tetragona
Oenothera fraseri

Herbaceous Perennial

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An herbaceous perennial to 80cm, with erect stems bearing smooth, ovate, glaucous leaves, reddish when young, and terminal racemes of light yellow flowers 3-5cm wide from late spring to late summer

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: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Loam Sand

Moisture: Well–drained
pH: Alkaline or Neutral

Position

Full sun

Aspect: South–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

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: Correct
Plant Range: E N America

How to Grow

Cultivation

Grow in moderately fertile well-drained soil in full sun

Propagation

Propagate by division in early spring or after flowering in late summer

Suggested planting locations and garden types

Coastal
Cottage and informal garden
Mediterranean climate plants
Low Maintenance
Flower borders and beds
Wall side borders

Pruning

Cut back after flowering

Pests

Slugs and snails may be a problem

Diseases

Leaf spot and powdery mildew may be a problem