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Herbaceous Perennial

Helianthus 'Monarch'
  • RHS AGM
  • RHS Plants for pollinators

sunflower 'Monarch'

'Monarch' is an herbaceous perennial making a clump to 2.5m tall, with lance-shaped or ovate leaves to 30cm long and semi-double, dark-centred, rich yellow flower-heads 10-15cm wide from late summer through early autumn

Synonyms
Helianthus atrorubens 'Monarch'

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Size
Ultimate height
2.5–4 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Clay
Loam
Moisture
Moist but well–drained
pH
Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Yellow Green
Autumn Yellow Green
Winter
Position
  • Full sun
Aspect

West–facing or South–facing or East–facing

Exposure
Sheltered
Hardiness
H5
Botanical details
Family
Asteraceae
Native to GB / Ireland
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. Will flower best after a long hot summer. May need support

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
  • City and courtyard gardens
  • Coastal
  • Flower borders and beds
Pruning

Cut back after flowering

Pests

May be susceptible to slugs and snails

Diseases

May be affected by powdery mildews and sclerotinia diseases

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