The wisteria bonsai is prized by bonsai enthusiasts due to the fragrant, cascading flowers that bloom on its branches. Most of the care of this bonsai focuses on increasing flower production, or preparing the tree for flowering. This specimen can grow large in size, so it requires a large pot and a good amount of sunlight to thrive. Care should also include adequate watering and the proper type of fertilizer. Pruning should be done to encourage flowering as well as to give the tree a well-groomed shape.
A large, deep pot should be used when planting a wisteria bonsai. The tree can be grown from seeds, but most people prefer to grow one from cuttings, which grow at a much faster rate. For best results, a rich, well-drained potting soil should be used. The wisteria bonsai typically does not begin producing flowers until it is 10 to 12 years old, and should be re-potted annually.
This bonsai variety grows best if it is placed in an area that receives full sun for the majority of the day, although it can tolerate partial shade. In addition to being placed in a sunny area, the wisteria bonsai should be left to grow in a place that is well protected from wind. As the tree gets larger in size, it tends to become top heavy and can easily be knocked over by strong gusts.
When compared to other varieties of bonsai trees, the wisteria requires a lot of water. The soil it is potted in should be kept moist, but not wet, at all times. A wisteria bonsai can be watered daily or placed in a tray of water. All of the water in such a tray should be absorbed by the plant before more is added.
A quality fertilizer will keep the tree healthy and encourage flowering. The wisteria bonsai has a bacteria in its roots that allows it to obtain nitrogen from the air, so the best fertilizer for it is low in nitrogen and high in potassium and phosphate. When a mature tree is flowering, it should be fertilized once a week.
Pruning a wisteria bonsai can make flowers bloom and will also keep its shape attractive. A groomed tree can take many different forms, but most gardeners experienced with shaping bonsai choose the informal upright or cascading styles. Aggressive pruning should be done in the beginning of spring by cutting the shoots back and leaving only two or three leaves on each.