• 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

Helianthus annuus 'Earthwalker'

sunflower 'Earthwalker'

sunflower 'Earthwalker'

© RHS

  • Other common names sunflower 'Earthwalker'

  • Family Asteraceae

  • Genus Helianthus can be tall, erect annuals, tuberous or rhizomatous perennials, with coarse simple leaves and large daisy-like flower-heads

  • Details 'Earthwalker' is strong, vigorous annual, up to 3m high, with coarse green leaves and abundant, multi-headed flowers, in late summer, with dark brown centres and ray florets which may be rich yellow, terracotta orange, dark red or warm brown

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)

    H4

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Sand

    Sand

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilChalk, Sand, Loam

  • pHAlkaline, Neutral

Size

  • Ultimate height 2.5-4 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 1 year

How to grow

Cultivation Sow in spring and grow in full sun in any fertile, well-drained, neutral, or preferably calcareous, soil. The flowers attract bees and other insects, and the edible seeds provide food for birds, especially finches

Propagation Propagate by seed sown in spring

Suggested planting locations and garden types Flower borders and beds Cut Flowers Wall-side Borders Cottage & Informal Garden Wildlife Gardens

How to care

Pruning No pruning needed

Pests May be affected by slugs and snails

Diseases May be affected by powdery mildews and sclerotinia diseases

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