Wisteria floribunda 'Kokuryū'

RHS Plant Profile

Japanese wisteria 'Kokuryu'

Other common names

Japanese wisteria 'Royal Purple', Japanese wisteria 'Russelliana'

Synonyms

Wisteria × formosa 'Black Dragon', Wisteria × formosa 'Kokuryū', Wisteria × formosa [Black Dragon], Wisteria floribunda 'Royal Purple', Wisteria floribunda 'Russelliana', Wisteria floribunda 'Violacea', Wisteria floribunda [Black Dragon], Wisteria russelliana, Wisteria sinensis 'Black Dragon'

Climber Wall Shrub

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A climbing perennial with pinnate green foliage. Fragrant, violet-purple flowers are produced in hanging racemes up to 50cm long, in early summer

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: West–facing or South–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

Cottage and informal garden
City and courtyard gardens
Climber and wall shrubs
Wall side borders

Pruning

Prune twice a year for best results, see Pruning wisteria for detailed advice

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