Helianthus annuus 'Waooh!'
sunflower 'Waooh!'
A compact and branching, fast-growing annual with oval to heart-shaped, green leaves. In summer, this multi-headed form flowers with enthusiasm, with plenty of sunny yellow flowers and dark brown centres. This smaller cultivar is ideal for containers or a the front of bed, to attract bees and butterflies and then birds with the seeds
Size
Ultimate height
0.5–1 metresTime to ultimate height
1 yearUltimate spread
0.5–1 metresGrowing conditions
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Gold Brown | Green | ||
| Autumn | Gold Brown | Green | ||
| Winter |
Position
- Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered Hardiness
H2Botanical details
- Family
- Asteraceae
- Native to GB / Ireland
- No
- Foliage
- Deciduous
- Habit
- Spreading branched
- Genus
Helianthus can be tall, erect annuals, tuberous or rhizomatous perennials, with coarse simple leaves and large daisy-like flower-heads
- Name status
Unresolved
How to grow
Cultivation
Grow in moderately fertile, neutral to alkaline, humus-rich, moist but well-drained soil in full sun. This plant was included in the RHS Helianthus (sunflower) trial 2024 https://www.rhs.org.uk/plants/trials-awards/plant-trial-results/fleuroselect-sunflowers
Propagation
Propagate 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
Suggested planting locations and garden types
- Wildlife gardens
- Cottage and informal garden
- Patio and container plants
- Flower borders and beds
- Cut flowers
- Wall side borders
Pruning
Cut back old stems after flowering as they die down for the winter
Pests
Diseases
May be susceptible to Powdery mildews and sclerotinia diseases
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.