|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
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(Japanese wisteria, Black Dragon wisteria)
Originating from Japan
A vigorous deciduous climber with clockwise twining stems and large leaves consisting of glossy dark green leaflets. ‘Yae-kokuryu’ has the darkest violet/blue double flowers of any Wisteria. These hang in long, pendant racemes up to 50cm in length. Floribundas, with their extra long blooms are better suited to growing on an arbour or pergola, as opposed to against a wall, so that the flowers will hang freely from overhead. Sometimes the flowers are followed by large velvety, runner bean-like seed pods.
Wisteria can be grown as a standard tree with a spreading, weeping crown of foliage and flowers.
Grow in fertile, moist but well-drained soil in sun or partial shade.
Eventual mature plant size :