Evergreen plant are those which has leaves persistent in all the four seasons. In contrast to deciduous plants which completely loose their foliage during winter or dry season. Pinus belonging to gymnosperms is an evergeen tree. The flowering plants under conditions of extreme cold shed their leaves and become dormant.
But Pinus due to the presence of bark, which is thick, needle-like leaves having sunken stomata, reduce the rate of transpiration. The cold areas are both physiologically and physically dry due to scanty rainfall, precipitation as snow, decreased root absorption at low temperature and exposed habitats.
But, Pinus is well adapted to such conditions. It continues to manufacture food during this period and grown to dominate otherplants. This show that Pinus is an evergreen tree. It do not shed its leaves, i.e., needles under any condition.
