Argyranthemum Summit White ('Cobwhite'PBR) (Daisy Crazy Series)

RHS Plant Profile
marguerite [Summit White]

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marguerite [Summit White] RHS

Synonyms

Argyranthemum 'Cobwhite'PBR
Argyranthemum Comet White Improved

Bedding

An evergreen, frost-tender subshrub, often grown as an annual, forming a compact mound of finely-divided, blue-green foliage to around 60cm tall. A mass of single flowers, white with a yellow centre, are borne above the foliage from late spring until the first frosts.

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

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

Growing Conditions

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

Position

Full sun
Aspect
South–facing or East–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)
H2
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
Argyranthemum are evergreen woody-based perennials or sub-shrubs, with simple or pinnately dissected leaves and white, yellow or pink, daisy-like flower-heads from late spring to autumn
Name Status
Trade

How to Grow

Cultivation

Grow in moderately fertile, well-drained soil in full sun. Deadhead regularly to prolong flowering and pinch growing tips to keep compact. Mulching may protect rootstock from frost, and helps to conserve water. Water in prolonged dry spells

Propagation

Propagate by softwood cuttings in spring, and semi-hardwood cuttings of non-flowering shoots at other times

Suggested planting locations and garden types

  • Patio and container plants
  • City and courtyard gardens
  • Mediterranean climate plants
  • Flower borders and beds
  • Wall side borders

Pruning

Pruning group 10, deadhead regularly

Pests

May be susceptible to chrysanthemum leaf miner

Diseases

May be susceptible to crown gall