Wisteria brachybotrys 'Okayama'
silky wisteria 'Okayama'
'Okayama' is an anticlockwise twining cultivar. The leaves are up to 35cm long with about 11 downy leaflets. Flowers in hanging sprays 10-15cm long are highly scented and open to pale lilac from rich violet buds. The bean-like seedpods are velvety and up to 20cm long
Size
Ultimate height
8–12 metresTime to ultimate height
10–20 yearsUltimate spread
Wider than 8 metresGrowing conditions
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green | |||
|---|---|---|---|---|
| Summer | Purple | Green | Green | |
| Autumn | Green | Green | ||
| Winter | Grey Silver |
Position
- Full sun
- Partial shade
Aspect
South–facing or West–facing
Exposure
Sheltered Hardiness
H6Botanical details
- Family
- Fabaceae
- Native to GB / Ireland
- No
- Foliage
- Deciduous
- Habit
- Climbing
- Potentially harmful
- Harmful if eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
- Genus
Wisteria are vigorous woody climbers with twining stems bearing pinnate leaves and long pendulous racemes of fragrant pea-like flowers in spring and early summer
- Name status
Accepted
How to grow
Cultivation
Grow in a fertile, moist, well-drained soil in sun or semi shade. May be trained into a large tree, on a wall, arch or pergola, or as a free-standing half standard. See wisteria cultivation for more advice
Propagation
Propagate by layering, softwood cuttings, hardwood cuttings or grafting
Suggested planting locations and garden types
- City and courtyard gardens
- Cottage and informal garden
- Wall side borders
- Climber and wall shrubs
Pruning
See pruning wisteria
Pests
May be susceptible to aphids, glasshouse red spider mite, and scale insects including wisteria scale
Diseases
May be susceptible to honey fungus (rarely), phytophthora root rot, coral spot, fungal leaf spot, virus diseases, and powdery mildews
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.