Simpy because , like any other crop, to maximise the return from a given space.
Latex
Mostly evergreen trees such as Pine trees are softwood.
softwood?
Needle-leaf trees produce softwood.
Crops grown on plantations include cotton, coffee, tobacco, sugar cane, sisal, and various oil seeds and rubber trees.
Pine is a soft wood. Generally speaking, Trees with leaves are hardwood, Trees with needles are softwood.
Softwood is typically found to be a sustainable material because of a few reasons. First, softwoods are able to be planted very close to one another, allowing for a great density trees meaning more product. Second, the trees that provide softwood (pine - yew) are typically fast-growing trees and therefore can help keep up with demand.
Softwood is from coniferous trees, which are types of gymnosperm trees. Other names for softwood is balsam, tamarack, pine, fir, or spruce.
on trees
The rain forest has hardwood and softwood trees. Softwood trees grow all over the world. Pine is a good example of softwood.
You can find pictures of softwood trees at the library. There are a variety of books about trees. You can also find pictures at your local garden center.
Softwood typically comes from coniferous trees such as pine, spruce, fir, and cedar. These trees are known for their needle-like leaves, cone-bearing fruits, and generally faster growth compared to hardwood trees. Softwood is commonly used in construction, furniture, and paper products.