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Herbaceous Perennial

Helianthus 'Double Whammy' (d)

sunflower 'Double Whammy'

'Double Whammy' is a clump-forming perennial to around 90m tall with rich green, ovate leaves.Double golden-yellow flowers up to 15cm across are borne from summer into autumn and comprise a ring of elliptic ray florets surrounding a central mound of tubular disc florets

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Moisture
Moist but well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Gold Yellow Green
Autumn Gold Yellow Green
Winter
Position
  • Full sun
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Hardiness
H5
Botanical details
Family
Asteraceae
Native to the UK
No
Foliage
Deciduous
Habit
Columnar upright
Genus

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

Name status

Accepted

How to grow

Cultivation

Grow in a moderately fertile, humus-rich, moist but well-drained, neutral to alkaline soil in full sun. Needs a long hot summer to flower well. May need support

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types
  • Cottage and informal garden
  • Prairie planting
  • Wildlife gardens
  • Flower borders and beds
  • Cut flowers
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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