Buddleja davidii, commonly called butterfly bush, is a deciduous shrub that is native to thickets on mountain slopes, limestone outcrops, forest clearings and rocky stream banks in China. It has escaped gardens and naturalized in some states.
The plant is noted for its bushy habit, arching stems, showy/fragrant flowers, and vigorous growth. Spike-like terminal and axillary flower clusters bloom from early to late summer, sometimes to first frost. Flowers are densely clustered in showy cone-shaped panicles. In the wild, straight species flowers are lilac to purple with orange-yellow throats. Numerous named cultivars have been introduced over the years, expanding the range of flower colors to include pinks, yellows, whites and reds. Flowers (each to ½” long) are mildly fragrant, and, as the common name suggests, very attractive to butterflies.