Needle source can refer to two different types of trees: PINE and FIR. PINE trees are evergreen conifers that are found in temperate climates around the world. They are characterized by their long, thin needles and their cones. FIR trees are also evergreen conifers, but they are found mainly in cooler climates. They have shorter, softer needles and their cones are more cylindrical in shape. Both PINE and FIR trees are important sources of needles for many uses, such as making furniture, clothing, and crafts.