Dave Powell/USDA Forest Service (retired) / Bugwood.org. All spruce trees have sharp-pointed needles that are often 4-sided or diamond-shaped in cross-section and have four whitish striped lines.

Example of conifer trees include pine, fir, spruce and cedar. Some shrubs which are conifers include juniper, arborvitae and others. Garden: Flowering plants that thrive in full sun and high heat.

Example of conifer trees include pine, fir, spruce and cedar. Some shrubs which are conifers include juniper, arborvitae and ...

Annual cold snaps have kept some invasive tree pests in check, but outbreaks could become more common with warming ...

Loveland’s tree streets include 22 streets named for trees in the Pine Family. The family includes 234 species worldwide and they separate into nine groups: cedars, Douglas-firs, firs, golden ...

Despite the name, this tree is not a true fir, pine or spruce. Don't miss our complete guide to growing holly trees and berries. Look to the Cones for a Tree Clue.

It stripped the needles from fir and spruce trees across most of northern Maine, killing 7 million acres of trees and costing the state’s forest economy hundreds of millions of dollars.

Now, researchers at the University of Texas at Arlington are using artificial intelligence to take the guesswork out of pollen tracking, starting with tree pollen.

The Douglas fir, also called a Douglas tree, Oregon pine or Douglas spruce, can grow hundreds of feet high — and the oldest of the species can live for over 1,000 years. The Douglas fir is the ...

Trees killed by caterpillar outbreak helped to fuel Minnesota wildfires The eastern spruce budworm left dead — and highly combustible — balsam fir on the landscape ...