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Typically, wisteria bonsai bloom time is in late spring or early summer, usually in May or June. The exact blooming time can vary depending on the specific variety of wisteria bonsai and the climate in your area. Some wisteria bonsai varieties may also have a second bloom in the fall, but this is less common.
Sometimes wisteria bonsai seems reluctant to flower. There can be many reasons why the bonsai is not flowering.
- Plant not mature enough to flower: It may be that it was grown from seed, and is not yet old enough to flower. Hence avoid growing wisteria bonsai from seeds if possible. Instead, use cuttings to grow wisteria bonsai so that your plant reaches maturity relatively quickly. It’s important to note that wisterias may take several years to bloom, so if your tree is still relatively young, it may simply need more time to mature. Some wisteria varieties may even take 10-15 years to bloom.
- Insufficient sunlight: Wisterias need at least six hours of direct sunlight a day to bloom well. Make sure your bonsai is placed in a sunny location. Please read Wisteria bonsai care for more details.
- Improper positioning: The roots of the tree are not cool enough. In natural settings, when growing on the ground, the plant usually grows in such a way that the foliage and flowers are exposed to full sun while the roots are in cool and moist soil. Imitate this by using a deep pot and keeping the base shaded, but letting the leaves receive full sunlight.
- Improper fertilization: Fertilize your wisteria bonsai with a balanced fertilizer during the growing season. Too much nitrogen can encourage foliage growth at the expense of blooms, so make sure the fertilizer has a higher ratio of phosphorus and potassium. Also, if you apply low-nitrogen fertilizer at the maximum rate recommended by the manufacturer, you may see results. Applying rapeseed fertilizer after blooming can also promote repeated blooming.
- Improper pruning: Prune your wisteria bonsai at the right time and in the correct manner. Remove any dead or diseased wood, and cut back new growth to a few buds in the spring and midsummer. This will help promote branching and flowering. Continue reading How to prune wisteria bonsai tree.
- Inadequate watering: Make sure your wisteria bonsai is getting enough water, especially during dry periods. Lack of water can stress the plant and inhibit blooming.
- Pests and diseases: Pests and diseases can damage the tree and prevent blooming. Regularly inspect your wisteria bonsai for signs of infestation or disease, and treat any problems promptly. Please read detailed guide on bonsai pests and diseases.
In order to encourage flowering in your wisteria bonsai, make sure all these factors are addressed.
How do you keep wisteria blooming all summer?
Wisteria typically blooms in the spring, but with proper care, you can encourage it to bloom throughout the summer. Here are some tips to keep your wisteria blooming all summer:
- Prune regularly: Regular pruning helps to promote new growth and encourages the production of more blooms. Prune in late winter or early spring, before new growth appears, and again in mid-summer to remove any faded flowers (after the first flush of blooms) and any growth that isn’t needed to encourage more blooms.
- Remove old wood: Remove old, woody stems that are more than two years old. These stems don’t produce many blooms and can limit the growth of younger, more productive stems.
- Shorten side shoots: Shorten side shoots to two or three buds to promote branching and more blooms.
- Fertilize: Wisteria requires plenty of nutrients to produce blooms, so make sure to fertilize regularly during the growing season. Use a balanced fertilizer with a higher middle number (phosphorus) to encourage flowering. You can use 15-30-15 ratio fertilizer.
- Provide proper sunlight: Wisteria requires plenty of sunlight to produce blooms, so make sure it is planted in a location that receives full sun for most of the day.
- Keep soil moist: Wisteria prefers well-draining soil that is kept consistently moist. Make sure to water it regularly, especially during hot and dry weather.
- Remove water sprouts: Remove any water sprouts or growth that appears from the base of the plant or along the trunk, as they don’t produce many blooms.
By following these tips, you can encourage your wisteria to bloom throughout the summer and into the fall, providing a beautiful display of color and fragrance in your garden.
