The kinds of trees that are often used as Christmas trees are called conifers or needleleaf trees. They are called needleleaf trees because their leaves are thin and sharp, like needles. Pines, spruces, and redwoods are all conifers.
Most conifers are green all year. They are called evergreens. They don’t change colour and lose all their leaves at a certain time each year as deciduous trees do. Instead, they lose a few needles at a time, all year round.
Conifer needles are very tough. They don’t freeze in winter, and they don’t lose water as quickly as other kinds of leaves do. By holding on to the water they have, conifers stay alive and green all winter.
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