About
A strong, vigorous annual, up to 4.5m high, with coarse green leaves and large flowers, 30cm or more across, in late summer and early autumn with dark brown centres and yellow ray florets.
About the genus
Helianthus can be tall, erect annuals, tuberous or rhizomatous perennials, with coarse simple leaves and large daisy-like flower-heads
Growing conditions
SunlightFull sun
Soil typeChalk, Loam, Sand
Soil pHAlkaline, Neutral
Soil moistureMoist but well-drained, Well-drained
AspectSouth-facing, West-facing
ExposureSheltered
UK hardinessH4
Plant details
Plant typeAnnual Biennial
HabitColumnar upright
FoliageDeciduous
Height4-8 metres
Spread0.5-1 metres
Time to full height1 year
Suggested usesWildlife gardens, Cottage and informal garden
Care notes
CultivationSow in spring with 60cm between plants, and grow in full sun in any fertile, well-drained, neutral, or preferably calcareous, soil. The flowers attract bees and other insects, and the edible seeds provide food for birds, especially finches
PruningNo pruning required
PropagationPropagate 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
Pest resistanceMay be susceptible to slugs and snails
Disease resistanceMay be susceptible to powdery mildews and sclerotinia diseases