The younger, newly hatched nymphs can be controlled with an insecticide and then breaking the cycle will control the problem. However, mature scale insects can be resistant to insecticides because of their hard shell. Wisteria can be infested by scale insects and can be treated with an insecticide. Wisteria ‘Amethyst Falls’ in bud Common Wisteria ‘Amethyst Falls’ problems The flowers are produced on new growth so if you cut in the spring you will be cutting the flower buds off. Prune back to 3 buds, this is done when there are no leaves on the tree. Prune again for a second time in mid-winter around January-February to shorten the same growth again. This helps to control the growth and helps promote more flower buds rather than new growth. The first time is a couple of months after flowering has finished and when new growth is shortened to about 5-6 leaves. Wisterias need to be pruned twice a year. However, if it is pruned at the wrong time of year you will diminish how it flowers and get a poor display. Wisteria is often thought to be a tricky plant to prune, but this really is not the case. If you’re looking for a climber to plant in a shady spot in the garden, see our climbing plants for shade guide. They prefer fertile, moist but well-drained soil. They respond best when planted in full sun, although they will grow well in light shade. It can be easier to control the size and keep it down to 6ft if needed without any problems. It is a more compact Wisteria and this makes it ideal for keeping in a pot. It originates from North America and is less evasive than other cultivars from Asia which have been known to slowly kill the trees they twine around. Ideal for cottage gardens, they grow well in large pots but are more at home when they are planted in the ground. This dwarf cultivar only grows to around 15ft (500cm) with a spread of 10ft (300cm) and is at home trained along a trellis or placed alongside pergolas and arches. This is where a section of another mature plant has been grafted onto a rootstock. Grafted plants are easy to spot by the bulge at the base of the plant. Most cultivars are often sold as grafted plants or plants grown by taking a cutting. This cultivar usually flowers a lot sooner than other cultivars and can often be purchased already in flower.Īvoid purchasing seed grown Wisterias as they can take up to 20 years to flower. Mature plants in hot summers can also produce velvety, green seed pods after the flowers. It produces masses of lilac-blue, petulant, sweetly scented flowers upon its twining stems from late spring through to mid-summer. The Wisteria Amethyst Falls is a fully hardy, deciduous and dwarf cultivar. But if you don’t have a large garden or an ideal position for such a large Wisteria there is another just as spectacular variety. Wisteria is available in many cultivars with most of them growing incredibly large, reaching heights of 30ft and spreads of 60ft. Our site is reader supported, this means we may earn a small commission from Amazon and other affiliates when you buy through links on our site.
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