Clerodendrum canescens Wall. is a shrub plant of the genus Clerodendrum in the family Lamiaceae. Gray haired young branches with slightly four edges, densely covered with long soft hairs; Leaves heart-shaped or broadly ovate, base heart-shaped or nearly truncated; The inflorescence is densely clustered into a head shape, with bracts ovate or elliptical, lobes ovate or broadly ovate, corolla white or light red, crown tube deep blue to black, red centimeter, lobes inverted ovate, long circular, and covered with calyx; The drupe is nearly spherical in shape; The flowering and fruiting period is from April to October. Grey haired Daqing has the effects of nourishing yin and clearing heat, promoting lung function and eliminating phlegm, dispelling wind and relieving pain, cooling blood and stopping bleeding in traditional Chinese medicine. It is mainly used for treating colds and high fever.