Wisteria, commonly known as wisteria, is a deciduous bonsai particularly suggestive for its cascading flowering. Depending on the variety blooms in spring or late summer producing flowers in fragrant racemes with the color lavender or purple whose poods and seeds are poisonous. The wisteria should be placed in full sun to ensure flowering and in winter, if grown in bonsai, it must be protected to avoid frosts.
Location
The Wisteria floribunda bonsai prefers a sunny and wind-repaired position, with at least 4-6 hours of direct light per day. It should be grown outside all year round: in summer if the sun is very strong in half shade; in winter it is necessary to shelter it from the intense cold, especially if temperatures drop below 5 ° C.
Watering
The common rule of watering that indicates to wet whenever the soil is dry to the touch, is also ideal in this case, considering, however, that in the warmest periods and in the presence of strong wind, it is necessary to intervene more frequently. Often, in fact, in these cases the ground is likely to remain completely dry. It is also good to keep in mind that both the lack and the excess of water can create serious imbalances to the plant.
Repotting
As a compound a well-draining mix is recommended. The best time is the beginning of spring, before the gems hatch. The frequency depends on the age of the tree: every two to three years in the young plants, every two or five years for the most mature, depending on the growth of the roots. During transplantation, it is appropriate to reduce the size of the roots to stimulate the formation of new thin roots.
Pruning
Pruning is a very important and delicate moment in the care of Wisteria floribunda bonsai. This species tends to develop long and vigorous branches, so it is essential to prune regularly to maintain the compact and harmonious shape of the bonsai. The best time to pruning is in the spring, removing excess shoots and branches that grow in unwanted directions. In particular, it is recommended to prune the older branches to promote the growth of new jets and stimulate a more abundant flowering.
Stabbing
It operates on the specimens already formed, in spring, to avoid the extension of new shoots. The stapling will be carried out during the vegetative growth season, to maintain the desired shape of the bonsai and promote the production of new shoots, improving flowering in the following periods.
Winding
The modeling must be carried out in the early stages of training, exploiting the flexibility of young branches to create more complex forms. The best era is in late spring or early summer, when growth is vigorous, but the branches are still flexible. As wisteria grows rapidly, the thread should be checked regularly.
Fertilization
Regular fertilization is essential to stimulate healthy growth and abundant flowering. During the growing season, it is important to feed the bonsai with a balanced fertilizer, which contains nitrogen, phosphorus and potassium in adequate proportions. This will help promote vegetative growth and promote a flowering rich in fragrant flowers. Fertilization will be suspended in summer, resumed in autumn and again suspended in winter, during vegetative rest.
Cure
The pathogens most often found on this species are aphids, cochineals and red spider. Attacks generally occur between spring and early autumn. In the case of aphids, specific acid shall be applied every 10 days, carrying out at least 3 interventions. To prevent the formation of the red spider, it is good to keep the plant in a ventilated environment: in case of attack intervene with acaricide. In addition, it is important to keep the soil well drained and avoid water stagnation to prevent fungal diseases.
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