• 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

Senna artemisioides

wormwood senna

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
wormwood senna

© RHS 2002

  • Other common names wormwood senna
    silver cassia

    feathery cassia

    see more
  • Synonyms Cassia artemisioides

  • Family Caesalpiniaceae

  • Genus Senna can be deciduous or evergreen shrubs , trees or perennials with pinnate leaves and terminal or axillary racemes, corymbs or panicles of usually yellow, bowl-shaped, 5-petalled flowers

  • Details S. artemisioides is an evergreen shrub to 2m in height, with downy grey-green leaves divided into linear leaflets, and axillary racemes of fragrant yellow or pale yellow flowers 1cm across, borne sporadically all year round

  • Plant range Australia

Characteristics

  • 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)

    H1C

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or East-facing

  • Exposure Sheltered

Soil

  • Chalk

    Sand

  • Chalk

    Clay

  • Chalk

    Chalk

  • Chalk

    Loam

  • MoistureMoist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1-1.5 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow under glass in a loam-based compost in full light with moderate humidity. Grow outdoors in moist but well-drained fertile in full sun in protected frost-free area

Propagation Propagate by seed or semi-hardwood cuttings

Suggested planting locations and garden types Low Maintenance Patio & Container Plants

How to care

Pruning Pruning group 1

Pests Generally pest free

Diseases Generally disease free

Advertise here

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