The buddleia are a family of about one hundred shrubs, both evergreen and deciduous, originating in Asia and southern Africa, also widespread in Europe and the American continent. They consist of tufts of long arched stems, covered with long lanceolate leaves, dark green, with the lower page white or gray. From the beginning of summer to autumn they produce large ears of beautiful tubular flowers, fragrant with honey and very colorful, pink, white or lilac, which attract butterflies.
The buddleias are easy to grow shrubs, with long flowering and are available in many colors and sizes. This is why they are widespread in our country, in Europe and in the United States, although they originate in Asia, Africa and South America.
In recent years they have become increasingly popular in our gardens, mainly thanks to their ability to attract insects, especially colorful butterflies (they are also known as "butterfly shrubs").
It is important, however, to point out that these plants have become very invasive, especially along the course of rivers, removing space for native essences. In some regions this is a real alarm and serious consideration is being given to limiting its sale and planting.
To stem the possible damages, it is extremely important to monitor the plants and keep them always clean by eliminating the exhausted floral panicles as soon as possible, absolutely before they go to seed.
In fact, it is precisely the extreme ability of self-dissemination that makes the buddleia so invasive. A single specimen, if not controlled, can produce up to 3 million seeds in a single year which, among other things, germinate with great ease.