You pass them every day. But when was the last time you looked at a tree? Appreciated that oak, from fat roots to fine slender limb tips? You might notice them more if they were electric blue. That’s ...

Sprinkled along the foothills of California’s Central Valley stand the iconic blue oak woodlands. Towering up to 80 feet tall and some reaching over 400 years old, the trees are home to one of the ...

Q: I planted eight blue spruce trees a year ago. This spring, I have noticed that two of the trees have a yellowish hue. They do not feel brittle, but they do not have the rich green and blue of my ...

In the frigid landscapes of northern Norway, an unusual phenomenon etched into the rings of trees and shrubs has offered a glimpse into the Earth's climatic history. Scientists have discovered that ...

Blue growth rings found in woody plant stems represent years when cells did not lignify properly because of summers too cold for growth When the going gets cold, even tough trees struggle with growing ...