• 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

Characteristics

  • 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)

    H6

Colour

Sunlight

  • Aspect

  • Exposure

Soil

  • Moisture

  • Soil

  • pH

Size

  • Ultimate height

  • Ultimate spread

  • Time to ultimate height

How to grow

Cultivation This plant is subject to strict controls as an invasive non-native species under the EU Regulation on Invasive Alien Species. As a result the RHS strongly recommends gardeners not to grow it, and consequently do not provide advice on how to cultivate it. If it is already present in your garden there is no requirement for you to eradicate it, but you do need to take utmost care with managing it and with disposing of unwanted material

Propagation

Suggested planting locations and garden types

How to care

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