• 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 'Valentine'

sunflower 'Valentine'

sunflower 'Valentine'

© � RHS 2000

  • Other common names sunflower 'Valentine'

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

  • Family Asteraceae / Asteraceae

  • Details 'Valentine' is a robust annual with single flowers to 17cm across, with light yellow rays around a contrasting deep brown centre

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureMoist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAlkaline, Neutral

Size

  • Ultimate height

    1-1.5 metres

  • Ultimate spread

    0.1-0.5 metres

  • Time to ultimate height

    1-2 years

How to grow

Cultivation Grow in moderately fertile, neutral to alkaline, humus-rich, moist but well-drained soil in full sun

Propagation Propagate by seed sown in-situ or in a pots or modules in spring

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

How to care

Pruning Cut back after flowering

Pests Can get slugs and snails

Diseases May be affected by powdery mildews and sclerotinia diseases

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