• 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

Cosmos bipinnatus 'Versailles Tetra' (Versailles Series)

cosmea 'Versailles Tetra'

  • Other common names cosmea 'Versailles Tetra'

  • Family Asteraceae

  • Genus Cosmos can be annuals or perennials with simple or pinnately divided leaves and large, long-stalked daisy-like flowers in summer

  • Details 'Versailles Tetra' is an upright, half-hardy annual, to 90cm tall, with feathery, finely-divided green foliage and pink blooms borne from summer until the first autumn frosts. The ray petals of each flower deepen in colour towards their base, forming a dark pink to reddish ring surrounding the central yellow eye of the flower

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

  • 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)

    H3

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or East-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Clay

    Clay

  • Loam

    Loam

  • Chalk

    Chalk

  • MoistureMoist but well-drained

  • SoilSand, Clay, Loam, Chalk

  • pHAlkaline, Neutral, Acid

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 1 year

How to grow

Cultivation Grow in moist, but well-drained soil in full sun. Suited to annual or cut-flower borders or as a summer infill

Propagation Propagate by seed sown at 16?C in mid-spring under glass, or in situ in late spring

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

How to care

Pruning Deadhead to prolong the flowering season

Pests Aphids and slugs may be troublesome

Diseases May be susceptible to grey moulds

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.