• 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

Dendromecon rigida

tree poppy

  • Other common names tree poppy
    bush poppy

    Californian poppy tree
    Californian tree poppy

    see more
  • Family Papaveraceae

  • Genus Dendromecon are evergreen shrubs with simple, leathery blue-green leaves and 4-petalled, poppy-like bright yellow flowers opening over a long period

  • Details D. rigida is a vigorous evergreen shrub to 3m tall, with blue-green, ovate leaves 5-10cm long, and an abundance of slightly fragrant, bright yellow flowers 5-7cm wide from late spring to early autumn

  • Plant range California


  • Foliage Evergreen

  • Habit Bushy

  • Fragrance Flower

  • 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

  • Exposure Sheltered


  • Loam


  • Sand


  • MoistureWell-drained

  • SoilLoam, Sand

  • pHAcid, Alkaline, Neutral


  • Ultimate height 2.5-4 metres

  • Ultimate spread 1-1.5 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in well-drained soil and full sun

Propagation Propagate by seed in spring or autumn; keep at 10-13?C (50-55?C). Propagate softwood cuttings in summer or by root cuttings in winter

Suggested planting locations and garden types Flower borders and beds Wall-side Borders Coastal City & Courtyard Gardens Cottage & Informal Garden

How to care

Pruning Pruning group 1 in early spring. Remove winter damaged shoots or shorten weak or bare shoots. If wall trained - pruning group 13 after flowering

Pests Generally trouble free

Diseases Generally trouble free

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