Wisteria brachybotrys 'Okayama'

RHS Plant Profile
silky wisteria 'Okayama'

Save a plant

Where do you want to save Wisteria brachybotrys 'Okayama'?

Plants I own
Wishlist
Go to My Plants
silky wisteria 'Okayama' RHS

Synonyms

Wisteria brachybotrys 'Iko yama fuji'

Award of Garden Merit
Climber Wall Shrub
Thank you - your purchase supports our charity work Buy this from RHS Plants Shop
Buy online from £42.99Buy this from Plant Nurseries
16 Suppliers

'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

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
10–20 years
Max Spread
wider than 8 metres
Max Height
8-12 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H6

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical 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