• 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

Rudbeckia hirta 'Indian Summer'

black-eyed Susan 'Indian Summer'

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
black-eyed Susan 'Indian Summer'

© RHS 2000

  • Other common names black-eyed Susan 'Indian Summer'

  • Synonyms Rudbeckia 'Indian Summer'

  • Family Asteraceae

  • Genus Rudbeckia may be annuals, biennials or rhizomatous herbaceous perennials, with simple or pinnately divided leaves and large daisy-like flower-heads with yellow or orange rays surrounding a prominent conical disk

  • Details 'Indian Summer' is an erect biennial with bristly stems bearing lanceolate to ovate leaves and dark-centred, broad-rayed, golden yellow daisies to 12cm across in summer and early autumn

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

  • 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)

    H3

Colour

Sunlight

  • Full Sun

  • Partial Shade

  • Aspect South-facing or West-facing

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Loam

  • Chalk

    Clay

  • MoistureMoist but well-drained

  • SoilLoam, Clay

  • pHNeutral, Acid, Alkaline

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1-2 years

How to grow

Cultivation Grow in moderately fertile, preferably heavy but well-drained soil in full sun or partial shade

Propagation Propagate by seed sown with gentle heat in spring

Suggested planting locations and garden types Flower borders and beds Cut Flowers Cottage & Informal Garden Wildflower meadow

How to care

Pruning No pruning required

Pests Generally pest free

Diseases Generally disease free

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