There are some 73,000 species of trees on Earth, according to one recent estimate. The writer Daniel Lewis zeroed in on a tiny fraction of them for his new book, "Twelve Trees." Each chapter is one ...

Challenging UNDATED (CNN) -- The first time Sam Van Aken saw tree branches being grafted and grown onto other trees, he likened it to Frankenstein. Yet, when the process became a full-time fascination ...

FORT WAYNE, Ind. (WANE) — A forest of bedazzled branches has sprouted in the Embassy Theatre halls, just in time for the Festival of Trees’ opening on Wednesday night. Over 60 different trees are ...

The distinctive scent of fir trees is appealing to consumers and may also help repel pests and deer. UC Davis biologists are taking part in a new project to study how trees make these scents and to ...

Conifers are generally better than broad-leafed trees at purifying air from pollutants. A new study shows that the best trees for air purification depend on the type of pollutant involved. Conifers ...