• 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

Lysichiton americanus

yellow skunk cabbage

yellow skunk cabbage

© RHS 1989

  • Other common names yellow skunk cabbage
    American skunk cabbage

    western skunk cabbage

    see more
  • Family Araceae

  • Genus Lysichiton are rhizomatous herbaceous perennials with large, lance-shaped leaves developing after the ovate white or yellow flower spathes surrounding the club-like, yellow or green flowering spadix

  • Details L. americanus is a robust herbaceous perennial with unpleasantly-scented, bright yellow arum-like flowers 40cm in height in early spring, followed by rich green oval leaves up to 1.2m in length

  • Plant range West N America


  • Foliage Deciduous

  • Habit Clump-forming

  • 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

  • Partial Shade

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

  • Exposure Sheltered or Exposed


  • Loam


  • MoisturePoorly-drained

  • SoilLoam

  • pHNeutral, Acid, Alkaline


  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation From March 2016 The EU Regulation on Invasive Alien Species will prohibit the sale and exchange of this species. Gardeners who already have it in their gardens must ensure it does not spread further. Thrives in fertile, humus-rich soil at pool margins, in full sun or partial shade

Propagation See cultivation note above

Suggested planting locations and garden types Low Maintenance

How to care

Pruning No pruning required

Pests Generally pest free

Diseases Generally disease free

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