Overview AppearanceBuddleja davidii is a deciduous shrub that is 3-15 ft. (1-5 m) tall with arching stems.FoliageThe leaves are opposite, 6-10 in. (15-25 cm) long, velvety and lanced-shaped.FlowersFlowering occurs from May to August, when dense clusters of tubular flowers develop. These flowers have 4 petals and can be purple, white or pink. The flowers produce high quantities of nectar and are attractive to butterflies, hence the common name.FruitThe developing pods are small upright ovate pods, which may not be readily visible through the remnants of the flower. When mature, the pods are a dark brown and opened at the tip. The seeds are dust-like particles which can easily be distributed by the wind.Ecological ThreatBuddleja davidii readily invades disturbed sites and riparian areas. Although butterflies will use this plant as a nectar source their larvae cannot survive on it. By replacing native larval food source plants butterflybush can have a negative impact on wildlife.