• 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 Cupcakes Mixed

cosmea [Cupcakes Mixed]

  • Other common names cosmea [Cupcakes Mixed]

  • 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 Cupcakes Mixed are erect, bushy annuals up to 90cm high, with very finely-divided green leaves and flowers from about midsummer to the first frost. The distinctive flowers, 10-12 cm across, have the outer rays fused together around the yellow centre to form a bowl; the flowers may be single or semi-double, and the outer rays may be white, pale pink, or pink with darker pink at the base


  • 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)




  • Full Sun

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

  • Exposure Sheltered


  • Loam


  • Chalk


  • Sand


  • Clay


  • MoistureMoist but well-drained

  • SoilLoam, Chalk, Sand, Clay

  • pHNeutral, Acid, Alkaline


  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1-2 years

How to grow

Cultivation Sow seed in spring and plant out from early summer, at 50cm spacing, in moist but well-drained soil in full sun

Propagation Propagate by seed in mid-spring: sow at 18-22°C, cover lightly with vermiculite, after germination reduce the heat to 10-15°C, and plant out when any risk of frost is over

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden City & Courtyard Gardens

How to care

Pruning No pruning required except deadheading to prolong the flowering season

Pests May be affected by aphids

Diseases May be affected by 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

We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.