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  • AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases
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Celosia argentea var. cristata (Plumosa Group) 'Century Rose' (Century Series)

cockscomb 'Century Rose'

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
cockscomb 'Century Rose'

© RHS

  • Other common names cockscomb 'Century Rose'

  • Family Amaranthaceae

  • Genus Celosia can be annuals, perennials or shrubs, with simple or lobed, alternate leaves and tiny, brightly coloured flowers in large, plume-like inflorescences. Many garden selections are closely related to C. argentea

  • Details 'Century Rose' is a bushy plant with plume-like inflorescences to 60cm on pale pink stems. Foliage is bright green and pink-flushed. Long lasting colour

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • 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

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureMoist but well-drained, Well-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1 year

How to grow

Cultivation Annual that can be grown outside once frosts have passed. Grow in loam-based potting compost (JI No 1) in full light with good ventilation. Moist but well-drained fertile soil in full sun in a sheltered position. Apply a balanced liquid fertiliser every 2 weeks

Propagation Propagate by seed

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden Patio & Container Plants

How to care

Pruning No pruning necessary

Pests Glasshouse red spider mite, glasshouse whitefly and aphids may be a problem under glass

Diseases Foot and root rot and fungal leaf spot diseases may occur

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