How I love wisteria! It graced the front wall of our modest three-up, three-down terrace house when we got married and I trained it proudly so that, in the six years we lived there, its territory was extended year on year.
It was the common Chinese wisteria (W. sinensis), generally the only kind that existed in our gardens for many years. Today, there are countless cultivars, mainly of Japanese origin, with strange names and, in some cases, strange colours and flower formations.
Wisteria at Iford Manor in Wiltshire
If you’re planting a new one, first check that you like the colour and flower form and buy a grafted plant, as it will bloom more reliably and at a much younger age. The graft union will be clearly visible a few inches above soil level. Plants that aren’t grafted and have been propagated by layering or cuttings can be irritatingly flower shy; there are ways to encourage blooming in older reluctant plants.
Wisteria needs a sunny wall. Don’t waste your time giving it a wall facing north or east. South and west are the more favoured aspects, where the wood will ripen most effectively. Then there’s the twice-yearly pruning. In July, tie in all questing growths that are needed to extend the plant’s coverage, but shorten all others to about 1ft. In January, cut back all sideshoots to finger length. Do this every year and your plant should not disappoint.
Your wall will need some kind of support framework, as wisteria is a twiner, with no sticky pads such as those on Virginia creeper or aerial roots on ivy. Stout horizontal wires fastened to sturdy vine eyes screwed into the wall at intervals of 18in give the most unobtrusive support.
A well-affixed trellis can be used, but the snaking stems can get behind it and, as they fatten over the years, they can prise it from the wall – regular untangling during winter pruning will reduce this risk.
Feeding your wisteria with a generous helping of rose fertiliser (rich in flower-promoting potassium and magnesium) every March will help to promote regular flowering and healthy growth. If your wisteria has been pruned and fed and grown on a sunny wall and still refuses to flower after three or four years, give it up as a bad job, haul it out and plant a grafted variety that will make up for lost time.
What medieval abbey is complete without a few twisting arms of wisteria?
Of the many varieties available, I particularly favour the old favourite Macrobotrys, which has flower trails that can be about 2ft long. The white varieties are wonderfully classy and, in the right situation, can be as spectacular as those of lilac purple.
I would never shun the plain W. sinensis, the flower trails of which give off the most delectable scent in spring sunshine, especially if trained around a bedroom window that can be opened to let in the heady fragrance.
Growing wisteria in pots and containers is seldom successful, as the plants are so greedy when it comes to food and water. If you lack a suitable house wall, you can grow wisteria as a free-standing ‘standard’ on a 5ft bare stem. It will need some support, but I remember massive free-standing specimens at Kew Gardens when I was a student there and, even then, they were a good century in age. They scrambled like boa constrictors over a rusted iron framework they’d all but demolished.
With everything in place, all you need do is cross your fingers for sunny weather and you can savour the delights of late spring and early summer in the company of one of the plant world’s most spectacular members.
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