The term evergreen plant means, in botany, that type of plant that, in temperate climates, has persistent leaves throughout the year and therefore also in winter. In some cases the leaves are maintained for a few years in a row, while the defoliation takes place progressively and slowly, generally at the moment of bud development and not in correspondence with seasonal changes.
At the same time and by extension, evergreen woods are those plant formations made up of holm oaks, cork oaks, pines, etc. and evergreen spots those consisting of myrtle, laurot, strawberry tree, etc., characteristics of the Mediterranean.
Evergreen plants are normally woody, trees and shrubs or bushes.
Evergreen plants are somewhat common and often prevalent, in humid tropical climates or in cold climates, where, for opposite reasons, the persistence of the leaves does not endanger the survival of the plant; moreover, many typical species of the Mediterranean maquis are evergreen.
Among the conifers, larch (Larix decidua) is an exception, which is the only needlewood to remain leafless during the winter; for this reason this plant is a deciduous tree.
An evergreen plant can still be influenced, in its behavior, by the habitat in which it lives in operation if this is more or less hot or cold.