Japanese wisteria is a beautiful vine in flower, but it is an aggressive grower and is considered invasive in some areas, especially in the southern United States. Review of risks should be undertaken before selecting this vine for planting sites.
This plant has some cultivated varieties. Go to list of cultivars.
- Shade tree,
- Large plant (more than 24 inches)
- Full sun (6 hrs direct light daily)
- Zone 5 (Chicago),
- Zone 6,
- Zone 7,
- Zone 8,
- Zone 9
- Alkaline soil,
- Moist, well-drained soil
- Mid spring,
- Late spring
Size and Method of Climbing
Japanese wisteria can grow 30 feet (or more). It is a twining vine. Twining vines climb by twisting their stems or leaf stalks around a support. This type of vine grows well on trellises, arbors, wires or chain-link fences.
Full sun is preferable. A moist, well-drained soil is best. Adaptable to a range of soil pH.
Wisteria often do not produce flowers for the first 5 to 10 years. To encourage flowering use nitrogen fertilizer sparingly and use a fertilizer that provides phosphorus (follow label directions).
Proper pruning will also encourage flowering. After flowering, prune excess growth back to 6 inches. These pruned stems will continue to grow. In winter cut them again so that each stem has two to three buds left. Proper pruning not only encourages flowering, but it also helps to manage size and shape of the vine.
Wisteria vines are heavy and require sturdy supports.
Disease, pests, and problems
No serious pests, but this plant is an aggressive grower and has become invasive in some locations.
Disease, pest, and problem resistance
Tolerant of black walnut toxicity.
Native geographic location and habitat
Native to Japan
The opposite leaves are pinnately compound, with 13 to 19 leaflets.
Violet, pea-type flowers in dangling clusters. The clusters are 8 to 20 inches long. Light fragrance. Flowers are produced in mid to late spring.
Fruit are similar in appearance to pea pods. Seeds are poisonous to eat (as are other parts of the plant).
Cultivars and their differences
Issai Perfect Japanese wisteria (Wisteria floribunda 'Issai Perfect'): White flowers, very fragrant.
Lawrence Japanese wisteria (Wisteria floribunda 'Lawrence'): Pale, lavender-blue flowers.
Longissima Alba Japanese wisteria (Wisteria floribunda 'Longissima Alba'): White flowers in longer clusters (18 to 24 inches).
Royal Purple Japanese wisteria (Wisteria floribunda 'Royal Purple'): Dark purple, double flowers.
Shiro Noda Japanese wisteria (Wisteria floribunda 'Shiro Noda'): White flowers.
Violacea Plena Japanese wisteria (Wisteria floribunda 'Violacea Purple'): Blue-violet, double flowers.