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Fragrance, flowers and a little excess we wholeheartedly approve 🤍
Family: Fabaceae · Pot diameter: 17 cm · Height: 70–75 cm
Wisteria ‘Alba’ creates a white flowering canopy of impressive scale and unusual visual lightness. Its fragrant racemes hang in clean, airy lines, often carrying the faintest lilac shadow while the buds unfold. Rather than darkening a pergola, it illuminates the greenery around it and gives an entrance, seating area or walkway the atmosphere of an old Japanese garden. This is the white climber that does not disappear into the background; it becomes the setting itself.
Its relatively late flowering extends the spring display, while fresh green leaves add translucent depth between the racemes. Later it creates cool summer shade and, once the foliage falls, reveals its sculptural trunk and the clear geometry of its trained framework branches.
This historic white selection, now accepted as Wisteria floribunda f. alba ‘Shiro-noda’, holds the RHS Recommended: Award of Garden Merit since 1993.
Its white display relies not on density but on brightness, free-hanging length and the elegant spacing between its flowers.
The racemes are long enough to create clear vertical lines beneath a beam without becoming visually solid. The youngest buds may retain a faint lilac tint.
It flowers towards late spring and early summer, often later than many other wisterias and alongside the new foliage.
Pure white remains visible even beneath a green canopy, while the deciduous wood allows winter sunlight to pass through the pergola.
Why you will love it: it combines the commanding presence of a mature wisteria with the brightest, calmest and most versatile colour choice.
The white flowering display reads best when the racemes hang freely at height. Use a heavy pergola, strong arch or firmly anchored wall wires, and keep it away from gutters, roofs and slender trelliswork. Its supported mature scale is about 4–8 m in height and 2.5–4 m in spread.
These combinations work in the outer root zones: white for continuity, blue for depth and golden yellow to keep the composition from feeling cold.
Full sun produces more numerous and cleaner white racemes; light shade usually reduces flowering.
Maintain deep, even moisture during establishment and water thoroughly through prolonged summer droughts.
RHS H6. The plant tolerates severe cold, although tender shoots and white flowers prefer a sheltered position.
All parts are harmful if eaten. Seeds and pods must be kept out of reach of children and animals.
Install permanent support before spreading the shoots. Against a wall, space the wires about 30 cm apart and far enough from the surface to allow air to circulate.
A sunny, sheltered position and deep, fertile, well-drained soil make the best combination. Organic mulch keeps the roots cool without touching the trunk.
Plant at the existing depth, loosen the outer roots only if they are very tightly bound and water slowly so moisture reaches the whole new root environment.
The 17 cm measurement describes the current pot. For long-term container growing, increase the size gradually to at least 45 cm, with a broad base, excellent drainage and support that does not depend on the pot itself.
Do not let the plant suffer repeated deep drought stress from July to September, a period associated with preparation for the following flowering season.
Use mature compost or, only when needed, a balanced feed. Too much nitrogen thickens the leafy shade and draws attention away from the white racemes.
In July or August, shorten the long shoots made that year to 5–6 leaves. This clears tangled growth from the structure and allows light to reach the spurs.
In January or February, leave 2–3 buds on those same side shoots. Work before the buds swell and take care not to damage the main framework branches.
Guide the strongest shoot towards the upper beam and keep the base open for inspection and watering.
Once it reaches the top, spread selected branches along the pergola. This is where the short flowering spurs will form.
With time, sun and repeated twice-yearly pruning, the racemes multiply and hang at different lengths below the green plane.
The high beam reveals each white, relatively airy raceme of 35–60 cm in full, while the green foliage creates luminous shade above.
‘Alba’ flowers relatively late among Japanese wisterias. The white season is followed by green summer cover, yellow autumn colour and complete leaf fall.
What to expect after planting: it will invest first in roots, its leader and permanent framework branches. The white floral curtain becomes denser only as the wood matures; do not expect immediate flowering, and maintain a consistent annual training programme.
The story of white Japanese wisteria begins with Philipp Franz von Siebold. Before 1829 he collected a plant in Japan that probably corresponded to the white form of Wisteria floribunda, while the 1839 Flora Japonica recorded the vernacular name “Siro Fudsi”. Living material travelled from Dejima, via Java, to the Netherlands during the 1850s.
Siebold offered a white wisteria in his nursery catalogue in 1856 and probably supplied the same line to Leiden Botanic Garden, where a historic accession survives. In 1890 Cornelis de Vos published the first valid description of ‘Alba’, highlighting its pure-white flowers and very long racemes.
The Japanese name ‘Shiro-noda’ appeared in Yashiroda’s nursery catalogue in 1931 and quickly entered international trade. Today the RHS accepts Wisteria floribunda f. alba ‘Shiro-noda’, with ‘Alba’, ‘Longissima Alba’ and ‘Shiro-naga’ among its synonyms. This same historic selection has held the RHS Recommended: Award of Garden Merit since 1993 and is rated H6 for hardiness.
In Japanese wisterias, flowering progresses acropetally. On a hanging raceme this means open white flowers sit higher, while the smaller buds remain towards the lower tip.
Mature stems of Wisteria can form successive cambia. Each new cambium produces additional zones of xylem and phloem, an anatomy that helps the long climber transport water and sugars.
Wisteria floribunda usually twines clockwise when viewed towards the growing tip, but exceptions have been recorded. Direction is a useful morphological clue, not an absolute identification on its own.
Practical answers about the white flowers, correct identity, mature dimensions and long-term training.
No. The ‘Alba’ shown here corresponds to the Japanese white line now recorded as Wisteria floribunda f. alba ‘Shiro-noda’, not to white Chinese wisterias or shorter-racemed species.
Mature flowers are pure white, but very young buds may show a faint lilac tint. Light and temperature subtly change the impression.
Usually from late spring into early summer and relatively later than several other wisterias, alongside the fresh green foliage.
With strong support it can grow about 4–8 m high and 2.5–4 m wide. Regular pruning controls the coverage, not the need for a sturdy structure.
Youth, too little sun, excess nitrogen, summer drought or removal of the short spurs can all delay the display. Maturity and consistency are essential.
Do not allow any part to be eaten. Keep pods and seeds away from accessible areas, collect fallen material and wear gloves when pruning.
