Rose-carpet knotweed is a gregarious low trailing herb that quickly covers the ground and rocks. Leaves ovate 1-2 cm, blue-green beneath. Flowers pink, in dense cylindrical erect clusters. Flowers 3-4 mm across. Trailing stems are red in color. This is a valuable ground-cover plant, of value for its early autumn flowering, and will scramble over rocks and wall edges quite happily. Native to the Himalayas, Kashmir to Bhutan.