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a 15-year-old yucca in a garden, - with a cistern beside it; does it have roots so large that it could damage this cistern in the future? I would not want to take away my beautiful yucca, but some friends advise me to do so because in the future its roots can affect the cistern that is next to it.
as often happens with succulent plants, the yuccas also do not produce a very deep or broad root system, generally the roots of these plants are contained, and at most they tend to widen over the years, producing small plant colonies; but they widen where they find completely free space, and therefore the walls of a cistern should be sufficient to remove them, without suffering any damage.
Often the yuccas are grown in pots, precisely because the root system is quite modest, and in fact the specimens grown in pots are as beautiful and lush as the relatives planted in the ground. This is not a plant that gives problems of this kind; but this is true, and this is true, of a plant that is quite invasive, not in the sense that once it has been planted, it is spreading in the garden; These plants tend to recover from any damage, and even small portions of the root bread can regenerate over months and give rise to a new head of leaves.
The yuccas are native to Central America; in Italy they are often sold as houseplants, and very often the species with stems are confused or assimilated to the dragon trees; but these are completely different plants, if not for the shape, at least for the cultivation requirements.
In fact, most species of yucca cultivated in Italy can live outdoors, even in the north of the peninsula; they survive temperatures close to -15 ° C, and the stiff and pointed leaves do not spoil even under the snow.
They are therefore rustic plants, but also very vigorous, which bear drought, bad weather, spring and autumn rains; they are perfect for giving an exotic touch to the garden, even if this is in Trento.
When the yuccas are well set in the garden, and the cultivation conditions are favorable, in summer they produce tall rigid stems, which bring enormous panicles made up of white bell-shaped flowers, truly a beautiful sight to admire in the garden. As with agaves, after flowering, each plant that carried the buds will stop its growth, but at its base we will see new side shoots, ready to develop until the new bloom.