This biennial, or perennial, is a typical member of the mustard family. It starts growth in late winter or early spring and becomes one of the first noticeable weeds in the lawn. As a turf weed, it is almost always found in the rosette stage. Leaves of yellow rocket are bright, shiny green, deeply notched along the edges and terminal in a large, rounded lobe. Under mowing conditions, the stems and flowering parts seldom have a chance to develop. Flowers are small, yellow, have four petals and are found in clusters at the tips of the uppermost branches.