Wisteria floribunda - Ito Koku Riu - Metal Arch - Height 250cm Width 150cm - 55lt

Wisteria floribunda ‘Ito Koku Riu’ is a dramatic and highly ornamental deciduous climber, celebrated for its exceptionally long flower racemes and rich colouring. A Japanese cultivar of the Japanese wisteria, it is particularly admired for the way its flowers open progressively from the base to the tip, extending the flowering display over several weeks.

In spring, fresh green, pinnate leaves emerge, each composed of 13–19 narrow, smooth-edged leaflets. The foliage is elegant and finely textured, providing a soft, flowing framework that complements the plant’s pendulous flowers. As the season advances, the leaves deepen in colour and form a dense canopy, making the plant attractive even after flowering has finished.

Flowering usually occurs in late spring to early summer, most commonly in May or early June in the UK. The racemes are long and slender, often reaching 40–60 cm, and sometimes even longer under ideal conditions. Each individual flower is a deep violet-purple, often with a subtle paler marking at the throat. The blooms are strongly fragrant, with a sweet, classic wisteria scent that carries well in warm weather and is highly attractive to bees.

‘Ito Koku Riu’ is a vigorous twining climber, capable of reaching 8–10 metres or more when mature. Like all Wisteria floribunda cultivars, it twines clockwise and requires substantial, permanent support. Regular pruning in summer and winter is essential to control its size, encourage spur formation, and ensure reliable flowering.

This wisteria performs best in full sun, where both flower length and colour intensity are maximised. It prefers fertile, well-drained soil and benefits from shelter from strong winds. Fully hardy throughout most of the UK, Wisteria floribunda ‘Ito Koku Riu’ is an outstanding choice for large structures where its cascading racemes can be appreciated to full effect, offering drama, fragrance, and a strong sense of Japanese garden tradition.