• AGM plants

    AGM plants have been through a rigourous 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

Campsis radicans f. flava

Yellow trumpet vine

AGM plants

AGM plants have been through a rigourous 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
Yellow trumpet vine

© � RHS 2002

  • Other common names Yellow trumpet vine

  • Synonyms Campsis radicans 'Yellow Trumpet'

  • Genus Campsis are fast-growing deciduous climbers clinging by aerial roots, pinnate leaves and clusters of tubular-funnel-shaped flowers in late summer or early autumn

  • Family Bignoniaceae / Bignoniaceae

  • Species C. radicans f. flava is a large, vigorous deciduous climber with strongly toothed leaflets and trumpet-shaped, deep yellow flowers to 8cm in length

Characteristics

  • Foliage Deciduous

  • Habit Climbing

  • Toxicity

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H4

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureMoist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height

    8-12 metres

  • Ultimate spread

    2.5-4 metres

  • Time to ultimate height

    5-10 years

How to grow

Cultivation A climber that despite its exotic-looking flowers is reasonably hardy if grown against a warm, sunny wall

Propagation Propagate by seed, layering, hardwood cuttings or root cuttings

Suggested planting locations and garden types Wall-side Borders Mediterranean Climate Plants

How to care

Pruning Pruning campsis; pruning group 12 in late winter or early spring

Pests Generally pest free but aphids may attack the flowers

Diseases Generally disease free

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