The leaves of trees in a taiga are described as being needle-like with a dark coloring and waxy coating. Taiga is a coniferous forest filled with spruces, evergreens, pines and fir trees. Unlike deciduous trees, coniferous trees do not drop their leaves.
The leaves of coniferous trees are adapted to the climates found in the taiga. Taigas have mild summers and long, cold winters, making it difficult for trees that drop leaves to regrow them in the spring. For this reason, coniferous trees do not drop leaves, enabling them to conserve energy. Despite the high snowfall generally found in a taiga, the ground remains frozen for long periods, which means that trees cannot absorb the water with their roots. The thin needles found on the trees have a smaller surface area than the leaves on deciduous trees, limiting evaporation of water vapor from the leaves.
The waxy coating on the needles further helps to insulate the water and keeps it within the leaves. Coniferous trees also tend to be darkly colored, helping the needles to absorb sunlight for use in photosynthesis. The needles are pointed, helping excess moisture and snow to slip off rather than sit on the tree and injure the branches.