Wisteria Amethyst Falls – General information, care and pruning
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Dwarf Wisteria ‘Amethyst Falls’
Wisteria is available in many cultivars but most grow very large and can reach heights of 30ft and spreads of 60ft. But if you don’t have a large garden or ideal position for such a large Wisteria there is another just as spectacular variety.
The Wisteria Amethyst Falls is a fully hardy, deciduous dwarf cultivar. It produces masses of lilac-blue, petulant, sweetly scented flowers upon its twining stems from late spring through to mid-summer. Mature plants in hot summers can also produce velvety, green seed-pods after the flowers. This cultivar usually flowers a lot sooner than other cultivars and can often be purchased already in flower. Avoid purchasing seed grown wisterias as they can take up to 20 years to flower, most cultivars are often sold as grafted plants or plants grown by taking a cutting. Grafted plants are easy to spot by the bulge at the base of the plant. This is where a section of another mature plant has been grafted onto a rootstock.
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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 along pergolas or arches. Ideal for cottage gardens, they grow well in large pots but are at home planted in the ground.
It originates from North America and is less evasive than other cultivars from Asia which have been done to slowly kill the trees they twine around. It is more a more compact wisteria which makes it ideal for a pot. It can be easier to control the size and keep it down to 6ft if needed without any problems.
Recommended planting position
They respond best when planted in full sun, although they will grow well in light shade. They prefer a fertile, moist but well-drained soil. If you’re looking for a climber to plant in a shady spot in the garden, see our climbing plants for shade guide.
Pruning Wisteria ‘Amethyst Falls’
Wisteria is often thought to be a tricky plant to prune, but this really is not the case. Although if it is pruned at the wrong time of year you will diminish how it flowers and get a poor display.
Wisterias need to be pruned twice a year, once a couple of months after flowering has finished when new growth is shortened to about 5-6 leaves. This helps control the growth and help promote more flower buds rather than new growth. Prune again for a second time in mid-winter around January – February to shorten the same growth again. Prune back to 3 buds, this is done when there are no leaves on the tree. The flowers are produced on new growth so if you cut in spring you will be cutting the flower buds off.
Wisteria ‘Amethyst Falls’ problems
Wisteria can be infested by scale insect and can be treated with an insecticide, however mature scale insects can be resistant because of their hard shell. The younger, newly hatched nymphs can be controlled with insecticide and breaking the cycle will control the problem.
Other common problems
The most common problem with wisteria is poor flowering and this can occur for a few reasons.
Why is my wisteria not flowering
- Poor pruning, prune twice a year as described above to promote more flowers.
- Plant in a sunny spot, planted in shade will result in poor or non-flowering.
- In sunny spells between July and September water regularly as drought can cause poor flowering in the following year.
- In poorer soils add sulphate of potash to the soil in Spring, as it may lack potassium, which the plant needs to promote good bud formation which in turn will encourage more flowers.