Helianthus annuus

RHS Plant Profile
common sunflower

Other common names

comb flower, golden, golden flower of Peru, St Bartholomew's star

Plants for pollinators
Annual Biennial

A tall, fast-growing annual with broad, oval to heart-shaped, roughly hairy leaves 10-40cm long. In summer it bears huge flowers up to 30cm across with bright yellow petals and dark brownish or purplish centres. The flowers attract bees and the seeds that follow provide food for finches

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

2.5-4 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
1 year
Max Spread
0.5-1 metres
Max Height
2.5-4 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
West–facing or South–facing
Exposure
Sheltered
Hardiness
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

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
Correct

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 in 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

  • Wildlife gardens
  • Cottage and informal garden
  • Flower borders and beds
  • Cut flowers
  • Wall side borders

Pruning

No pruning required

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to powdery mildews and sclerotinia diseases