Garlic mustard produces a characteristic fragrance of garlic from all parts of the plant. Plants flower and fruit when 2-4 feet high. Blooms May through June. Plants usually produce 1 flowering stem but may have as many as 10 stems from a single root. Flowers are numerous, small, white, 1/4 inch across, and are borne in a terminal raceme at the apex of the stem and also at some leaf axils. Each flower has 4 white petals that narrow abruptly at the base. Basal rosettes have dark green, kidney-shaped leaves. Stem leaves are sharply toothed, triangular, alternate, and have petioles (leaf stems). The leaves also have large teeth around the margins and are 2-3 inches wide. Seeds are black and produced in narrow podlike capsules (siliques) 3/4 to 3 1/4 inch long.