If allowed to grow unchecked, weeds can reduce growth of desired plants through competition. Weeds can harbor other pest problems such as aphids or whiteflies.
Weeds also reduce the aesthetic value of plants being grown for sale.
There are several woodsorrel species that are weed problems. Each leaf of woodsorrel is divided into three heart-shaped lobes. Leaves of woodsorrel somewhat resemble a clover leaf, although woodsorrel is not in the legume family. Woodsorrel has greenish or reddish colored leaves and yellow flowers. Bittercress, a member of the mustard family, has white flowers and cigar-shaped fruit.