Discuss the names of trees. (oak, elm, maple, hickory, cedar, pine, etc.)
Explain to the children that some trees loose their leaves- those trees are called "deciduous".
There are trees that do not loose their leaves and stay green all year long-those tree are called "evergreen".
Explain that evergreen trees are used as Christmas trees.
Ask: What would happen if we used deciduous tree for Christmas trees instead of evergreen?