BUTTERFLY TREE (Buddleja davidii) TREES AND SHRUBS - YouTube

It is a native species from northwestern China, Tibet and Japan, its use has been extended as an ornamental plant throughout the world gardens.
Deciduous or semiperennifolium that reaches about 2-3 m in height, with flowers of lilac, blue, purple, pink, red-violet, white and so on. Between summer and autumn, its arched branches carry at their ends long narrow cones of densely packed flowers. The flowers attract the butterflies, which feed on their fragrant nectar.

Requires light soils, well drained, but withstands limestones. Temperate climate, withstand the cold without difficulty and sunny exposure. It must be pruned annually in winter, so that new buds will flourish that will bloom at its ends, it is possible to emphasize its delicious aroma that much remembers the smell of the honey.

Campanula rapunculoides - Wikipedia, the free encyclopedia
The flowers are bright blue-violet (rarely white), 2 to 4 cm long, with short petioles on one side in the armpits of the bracts. The basal leaves are triangular, narrow, with a heart-shaped or rounded base, jagged edges and up to 12 centimeters long.

It has become naturalized in Australia and most cities in central and southern Europe, where it easily spreads through wastelands and gardens. It can be invasive in many regions, including the British Isles and New Zealand. In addition, in the USA. Has been naturalized from crop failures and has been classified as a harmful plant in the states of Oregon and Washington.

Because of its potential colonizer and a serious threat to native species, habitats or ecosystems, this species has been included in the Spanish Catalog of invasive alien species, being prohibited in Spain its introduction in the natural environment, possession, transport, traffic and commerce.