Purple (or red) deadnettle is a winter annual with square stems and purple or red flowers. It spreads by seeds and belongs to the mint family. All leaves occur on short petioles, are sparsely hairy and are circular in outline with scalloped margins. Leaves are 8 to 12 mm long and dark green in color. The upper leaves of purple deadnettle are relatively triangular in outline and red to purple in color. The flowers are light purple to red in color and arranged in spirals 1 to 2 cm long. Stems branch from the base of the plant and may reach 16 to 18 inches in height.
