As daytime temperatures begin climbing, as early as March or April in some areas, the drab colors of winter give way to the bright colors of spring. Tree buds swell as sap begins moving up from the roots of trees and shrubs, lawns turn green, not from grass but from the weeds mixed in, and wildflowers burst open. Many of these emerging plants are edible. Teas can be made from roots and leaves and wild salads from leaves and flowers. Additionally some of these plants can be cooked as potherbs.