This is one of the smallest members of the mustard family and it seldom reaches a foot in height. Mouse-ear cress forms a rosette of tiny leaves and occurs in dense stands where turf is weak or thin. As an annual or biennial, it generally recurs in the same areas year after year. Leaves are narrow, short and pointed, with irregular edges. Flowers are tiny and white with four petals. Mouse-ear cress often blooms during warm spells of February or March. Seed pods are long, narrow and pointed upward from the main stem. Whitlow grass and mouse-ear cress often grow side by side.