Butterfly Bush (Buddleja davidii)
Butterfly bush is found commonly throughout most of the world and has become a popular plant in cultivation. Long clusters of flowers come in white, purple, blue, yellow and magenta, which bloom throughout the summer. A fast grower, the butterfly bush can grow three to four feet in one season and reach 8 to 10 feet in height, but can be maintained at a shorter height with an aggressive approach to pruning. They may also be trimmed to a single stem creating a very small tree.
As the name implies, butterflies are attracted to its flowers as a source of nectar. Its narrow, dark-green leaves are pale green underneath and grow on exfoliating bark. In wetter climates with fertile natural soils, the butterfly bush can become invasive and escape into the wild. In Utah, however, it stays put and survives with minimal amounts of irrigation.