Romneya coulteri 'White Cloud'

RHS Plant Profile
Californian tree poppy 'White Cloud'

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Californian tree poppy 'White Cloud' Dorling Kindersley 2003
Californian tree poppy 'White Cloud' RHS

Synonyms

Romneya 'White Cloud'
Romneya × hybrida 'White Cloud'
Romneya × hybrida hort.
Romneya × vandedenii

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Herbaceous Perennial
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A vigorous suckering woody-based perennial with bright, glaucous grey-green, pinnately lobed leaves and cup-shaped pure white flowers 12cm across, with conspicuous deep yellow stamens, over a long period in summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

1.5-2.5 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
2–5 years
Max Spread
1.5-2.5 metres
Max Height
1.5-2.5 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
East–facing or South–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
Papaveraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Romneya are suckering subshrubs with pinnately lobed leaves and large white flowers in summer
Name Status
Accepted

How to Grow

Cultivation

Grow against a warm, sunny wall protected from cold winds. Mulch deeply prior to winter. They dislike transplanting

Propagation

Propagate by basal cuttings in spring, or root cuttings in winter

Suggested planting locations and garden types

  • City and courtyard gardens
  • Mediterranean climate plants
  • Coastal
  • Cottage and informal garden
  • Low Maintenance
  • Flower borders and beds
  • Wall side borders

Pruning

Pruning group 6

Pests

Caterpillars may be a problem

Diseases

May be susceptible to powdery mildews