Helianthus tuberosus 'Dwarf Sunray'

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A dwarf, floriferous herbaceous perennial to around 150cm in height, with coarse dark green leaves. Bright yellow, sunflower-like flowers appear in summer. It is cultivated for its knobbly, elongated pale-cream or sometimes purple-tinted tubers

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
1-1.5 metres

Growing Conditions

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

Position

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

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
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

Propagation

Plant tubers in spring in a moderately fertile, moist but well-drained soil in full sun. Plants may need support in exposed positions. May have the potential to become a nuisance if not managed well. For more advice follow jerusalem-artichoke cultivation

Suggested planting locations and garden types

  • Cottage and informal garden
  • Prairie planting
  • Cut flowers

Pruning

Cut back old stems after flowering as they die down for the winter

Pests

May be susceptible to snails and slugs damage when young

Diseases

May be susceptible to Powdery mildews and sclerotinia disease