Sunflower

Helianthus | Rating: 0 votes | Print / Pdf

Helianthus is a group of around 52 species that include the ever-popular sunflower. There are both perennial and annual specimens in Helianthus, and some are famed for their height. Species normally flower in the summer months, producing large and brightly coloured disk shaped blooms. Helianthus should be planted in full sun and given fertile, well-drained soil in which to thrive. Large varieties often need staking to stop the stems breaking, as they become top heavy. Annual varieties should be sown during late spring, with seeds being collected as blooms die in the autumn.

Rate it:
Plant
Known dangers?
  • no
Height [m]
  • 1.5 - 2
Spread [m]
  • 0.2 - 0.5
Dominant flower colour
  • Yellow
Flower Fragrance
  • No, neutral please
Flowering seasons
  • Early spring
  • Mid spring
  • Late spring
Foliage in summer
  • Green
Propagation methods
  • seed
  • basal cuttings
  • division
Growth habit
  • Branching
  • Erect
  • Tall
Environment
Acidity
  • Neutral
  • Alkaline
Hardiness zone
  • Varies
Heat zone
  • Varies
Winter temperatures [°C]
  • 0
Heat days
  • 0
Moisture
  • well-drained
  • well-drained but frequently watered
Soil type
  • sandy
  • Clay
  • chalky
  • loams
Sun requirements
  • Full sun
Exposure
  • Exposed
  • Sheltered
Usage
Standard category
  • Flowers & bulbs
  • Wild flowers
Grown for
  • Attractive Flowers
Creative category
  • Fast growing
  • For Beginners
  • Colours
  • For birds & bees
Garden type
  • Woodland
  • Cottage garden
  • Meadows
  • Prairies
Garden spaces
  • Flower beds
  • Cut flowers
  • Borders
Gardening expertise
  • beginner
Time to reach full size
  • Less than one year