The most eco-friendly Christmas tree is one that lasts for years. Here’s how to choose, decorate, and care for a living tree
Courtesy of Monrovia
Austrian black pine (Pinus nigra). A dense conical tree with a uniform crown and stiff, very dark green needles.
Grows slowly to 40 to 60 feet tall. Mature trees develop flat tops. Zones A3, 2-10, 14-21.