Wisteria x formosa 'ISSAI'

Wisteria x formosa 'ISSAI'
japanese wisteria

SIZE/TYPE	vine
USUAL HEIGHT	8-10m
USUAL WIDTH
LEAVES	deciduous broadleaf
COLOUR OF LEAVES	green
FLOWERS	showy
COLOUR OF FLOWERS	violet
BLOOMING TIME	May - June
LOCATION	full to partial sun
USDA zone (lowest)	5 (down to -29°C)
WINTER PROTECTION
FOR ZONE 5+6
FOR ZONE 7
BELONGS TO CATEGORIES	Deciduous broadleaf

This wisteria is a cross between Japanese and Chinese wisteria. The result is a compact and fat raceme of slightly fragrant pea-like flowers. Issai is a variety with mauve to violet flowers with a central greenish-yellow blotch. They come out in May along with leaves or after they have emerged and are followed by seed-pods with poisonous seeds. Pinnate leaves look rather exotic and densely cover the plant and its support from the ground level. They are light green.

The support is necessary even for tree forms because the wood of this climber remains very flexible for many years. The plants flower mainly on short spurs so cut back unwanted side branches to 2-3 buds to encourage formation of flowering spurs.

It needs moist, acidic soil. Young plants require a sheltered place, mature plants (and those with a stem) are fully hardy to -29°C (USDA zone 5).

Last update 28-01-2009

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GLOSSARY

STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
SHRUB - a woody plant with branches growing bushy from the ground level.
HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.