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Helianthus x laetiflorus (Perennial sunflower)

Skill rating
skill rating
Maintenance level
1 hour care
per year
Ultimate height
Max height
Ultimate spread
Max spread
Time to maturity
1-2 years
To maturity

Botanical name: Helianthus x laetiflorus

Other names: Perennial sunflower, Showy sunflower, Prairie sunflower, Rough-leaved sunflower, Stiff sunflower, Helianthus rigidus, Helianthus scaberrimus, Helianthus pauciflorus

Genus: Helianthus

Species: H. x laetiflorus - H. x laetiflorus is a tall, spreading, bushy, rhizomatous perennial with rough, upright stems bearing narrowly-ovate, toothed, dark green leaves and bright yellow flower heads from late summer to mid-autumn.

Helianthus x laetiflorus is: Deciduous

Flower: Bright-yellow in Summer; Bright-yellow in Autumn

Foliage: Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn

Habit: Bushy, Erect flower stem, Spreading, Tall

Watch out for

Specific pests: Slugs , Snails

Specific diseases: Powdery mildew , Sclerotinia diseases

General care

Pruning: Divide every 2-4 years to maintain vigour. Cut back after flowering.. REGISTER to read more...

Propagation methods: Division. REGISTER to

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Helianthus x laetiflorus (Perennial sunflower) will reach a height of 2m and a spread of 1.2m after 1-2 years.

Suggested uses: Add to salads, Architectural, Beds and borders, Containers, Cottage/Informal, Flower Arranging, Wildflower

Cultivation: Grow in moist or moist but well-drained, neutral to alkaline soil in full sun. Suited for use near water. Needs long, hot summers to flower well. May need support. Mulch annually with garden compost or well-rotted manure. Site carefully as may be invasive

Soil type: Chalky, Clay, Loamy

Soil drainage: Moist but well-drained

Soil pH: Alkaline, Neutral

Light: Full Sun

Aspect: South, East, West

Exposure: Sheltered

Hardiness: Hardy (H4)

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Soil types: Chalky, Clay, Loamy Tell us...
Soil drainage: Moist but well-drained Tell us...
Soil pH: Alkaline, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...


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