With evergreens, foliage is shed differently from deciduous trees. They seem green year round. Plants that are intermediate may be called semi-deciduous; they lose old foliage as new growth begins. Other plants are semi-evergreen and lose their leaves before the next growing season, keeping some in winter or dry periods. Some trees, including a few species of oak, have desiccated leaves that stay on the tree through winter. These persistent dry leaves are dropped in the spring as new growth begins.