Have you ever seen a leaf that may be 10 years old? Yes, when you look at many conifers.

The leaves or needles of conifers - such as pines, spruces and firs - survive two to 10 years and are gradually shed. Leaves on deciduous trees fall once a year.Conifers make up about 30 percent of the world's forests. According to Georgia-Pacific Corp., a forest products firm, conifers are used in papermaking and home and building construction.