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giant sunflower | Plant Finder | Fill My Garden

Home/Plants/Perennials

Plants > Perennials

giant sunflower

Helianthus giganteus

Genus: Helianthus
Family: Asteraceae

About this plant

A clump-forming perennial, up to 2.5m in height, with narrow, coarse green leaves and small flowers in late summer and early autumn, with dark yellow centres and yellow ray florets on dark reddish to green stems

Growing Information

Height

2.5-4 Metres

Spread

1-1.5 Metres

Hardiness

Foliage

Deciduous

Growing Conditions

Sunlight

Full SunPartial Shade

Soil

ClayLoamSandyChalk

Neutral

Not Currently Available

This plant is not currently stocked at any garden centres on our platform.

Alkaline

Moisture

Poorly DrainedWell Drained

Aspect

West FacingEast Facing

Exposure

Exposed

Care Guide

Cultivation

Grow in a moderately fertile, humus-rich, moist, well-drained, neutral to alkaline soil in full sun. May need support. See staking: perennials

Pruning

Deadhead to prolong flowering

Propagation

Propagate by seed sown in-situ, or in pots or modules, in spring

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to Powdery mildews and sclerotinia diseases

Garden Uses

Uses

Ground CoverBanks SlopesFlower BordersWildflower MeadowRock Garden

Planting Places

IndoorOutdoorWall Trained

Season of Interest

SpringSummerAutumn

Size & Characteristics

Height

2.5-4 Metres

Spread

1-1.5 Metres

Habit

Clump Forming

Time to Full Height

Two To Five Years