Buddleja davidii, commonly known as butterfly bush, is a deciduous shrub native to China that belongs to the family Scrophulariaceae. It is widely cultivated as an ornamental plant due to its attractive and fragrant flowers, which attract butterflies, bees, and other pollinators.
The shrub typically grows to a height of 2 to 5 meters and has arching branches with gray-green leaves that are lance-shaped and covered in fine hairs. The flowers of Buddleja davidii are usually pink, purple, or white and are arranged in panicles that can reach up to 30 cm in length. The flowers bloom in midsummer to early autumn and are known for their sweet fragrance.
Buddleja davidii is a fast-growing shrub that is easy to care for and prefers full sun to partial shade. It can tolerate a wide range of soils but prefers well-draining soils that are slightly acidic. The shrub is also drought-tolerant once established and can withstand temperatures down to -15 °C.
Despite its popularity as an ornamental plant, Buddleja davidii is considered an invasive species in many parts of the world, including North America and Europe, where it can spread rapidly and compete with native plants for resources. Therefore, it is important to use caution when planting butterfly bushes and to dispose of any unwanted plant material properly.