Question: Are wisteria roots harmful?
Good morning, I would like to plant a wisteria in a very large garden. I would be happy to get a small pergola, a couple of meters wide by three. Pruning may be enough to keep the branches under control. But the roots are intrusive. At what distance from other fruit plants and walls should I keep the drums to avoid damage? Nearby I have a lotus tree, and I would like to plant another one of fig or cherry.
Thanks for the suggestion you want to give me, Annarita
Answer: Are wisteria roots harmful?
as with most climbing plants, wisteria also produces a beautiful, robust and broad root system; rather than worrying about the proximity to other plants, generally this plant gives problems if it is planted near a pavement, as the roots tend to develop even rather shallowly so they can over time damage the surface of a driveway or garden flooring; in fact, however, if these constructions are in cement, with a good base that acts as a foundation, the wisteria tends not to disturb and to move away. In my garden there is a wisteria, planted in 1971, about a meter from the concrete driveway, which was not affected in any way by the roots of the plant.
Also with regard to the proximity to other trees, try not to place them at, less than a couple of meters, but consider that in general the two plants will tend not to compete for space in the ground, as the two root systems will tend to develop in different directions.
More than anything else you will have to worry about the arbor on which the wisteria will develop, as the branches of this plant grow enveloping the supports, and in doing so, over the years, they tend to crush them; so if you were thinking of a light pergola, built with thin wooden posts, maybe you should turn to something more resistant, like a metal pergola or more robust and resistant piling. With the passage of time the plant will constitute a real stem, which will tend to incorporate the supports, which will become real parts of the stem of the plant itself.
My forty-year-old wisteria survives leaning against a huge pergola, whose vertical poles are metal pipes, those that are used for the scaffolding of the masons, painted in blue; the horizontal poles, on the other hand, are thinner and more flexible, and there are many, as over time the plant develops so many branches, and in a single year it manages to produce thin green branches even more than four or five meters long. Clear, a small wisteria of a few years of age, should not immediately need all these supports, but keep in mind that a shaky arbor, must necessarily be replaced in the coming years.
In fact there are now many varieties of wisteria in the nursery, some seem to be a little less vigorous than the varieties that were available at one time, in particular the Japanese and double-flowered wisterias seem less aggressive, ask the nurseryman information on the varieties he has available .