Violets are extremely attractive and are seldom considered in the same class as weeds. But, occasionally violets escape from the flower garden and become established in turf. They are truly one of the most difficult plants to eradicate. Leaves of wild violet are heart-shaped and regularly lobed along the edges. The surface is very irregular. Flowers are an attractive deep blue to purple. Even though the violet grows in clumps, it can spread easily by strong rootstalks. Violets generally thrive in cool, moist areas. Other members of this family can have very unusually shaped leaves and flowers that range from white to pink to bright yellow.