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Herbaceous Perennial

Helianthus angustifolius

autumn glory

A clump-forming herbaceous perennial with rough green narrow leaves to a height of 2m. In late summer and autumn bears yellow daisy flowers with purple-red, or sometimes yellow disks

Other common names
swamp sunflower
swan sunflower

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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
1–2 years
Ultimate spread
1–1.5 metres
Growing conditions
Chalk
Sand
Loam
Clay
Moisture
Poorly–drained, Moist but well–drained
pH
Neutral, Alkaline
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Yellow Purple Red Green
Autumn Yellow Purple Red Green
Winter
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Asteraceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
Genus

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

Name status

Correct

How to grow

Cultivation

Grow in a moderately fertile, humus-rich, moist but well-drained, neutral to alkaline soil in full sun. Does well in soils that don't dry out in summer. May need support. See staking: perennials

Propagation

Propagate by seed or division. Divide established clumps every 2-4 years to both increase plants and retain vigour. See sowing seeds indoors for further advice

Suggested planting locations and garden types
  • Cottage and informal garden
  • Wildlife gardens
  • Low Maintenance
  • Flower borders and beds
  • Wall side borders
Pruning

Cut back after flowering

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to Powdery mildews and sclerotinia diseases

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