Overview
Helianthus decapetalus 'Flore Plenus' is a bushy, clump forming annual biennial in the genus Helianthus, part of the Asteraceae family, with deciduous foliage. Helianthus decapetalus 'Flore Plenus' grows best in full sun, and tolerates loam soils and neutral and alkaline pH. Its UK hardiness is rated H5. Suggested uses include wildlife gardens, cottage and informal garden, flower borders and beds and cut flowers.
About
Helianthus decapetalus 'Flore Plenus' is a bushy, clump-forming cultivar of the Helianthus genus, which comprises upright annual and biennial plants with broad, simple leaves and large daisy-like flower heads. This deciduous plant thrives in full sun on south-facing, sheltered sites with moist but well-drained loam soil that is neutral to alkaline in pH. Hardy to UK zone H5, it is suitable for wildlife gardens, cottage and informal gardens, flower borders, and as cut flowers. It can be propagated by seed or division and is particularly notable in spring.
About the genus
Helianthus is a genus comprising around 50 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. The species of Helianthus are native to North America. The best-known species is the common sunflower.
Wikipedia contributors, "Helianthus", CC BY-SA 4.0 — Helianthus
Growing conditions
Best soil and position for Helianthus
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral, Alkaline
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
Helianthus decapetalus 'Flore Plenus' size, habit and characteristics
- Plant type
- Annual Biennial
- Habit
- Bushy, Clump forming
- Foliage
- Deciduous
- Suggested uses
- Wildlife gardens, Cottage and informal garden, Flower borders and beds, Cut flowers
Care notes
Pruning and caring for Helianthus decapetalus 'Flore Plenus'
- Propagation
- Seed, Division
- Pest resistance
- Susceptible to slugs and snails
- Disease resistance
- Susceptible to powdery mildews and sclerotinia diseases
Frequently asked questions
Where is the best place to plant Helianthus decapetalus 'Flore Plenus'?
Helianthus decapetalus 'Flore Plenus' prefers full sun. It suits sheltered positions.
What soil does Helianthus decapetalus 'Flore Plenus' need?
Helianthus decapetalus 'Flore Plenus' grows best in loam soil. It prefers neutral and alkaline soil. Aim for soil that stays moist but well-drained.
Is Helianthus decapetalus 'Flore Plenus' hardy in the UK?
Helianthus decapetalus 'Flore Plenus' has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.
How do I propagate Helianthus decapetalus 'Flore Plenus'?
Seed, Division.
More in the Helianthus genus
- Helianthus 'Carine'Sunflower
- Helianthus annuus Solano Orange Nr. 14 (Solano Series)Common Sunflower
- Helianthus orygalis
- Helianthus scaberrimusSunflower