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 ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. The quandong’s fruit appear intensely blue, but without ...

Blue spruce (Picea pungens f. glauca), also called Colorado blue spruce, is a beautiful tree with blue-gray needles. Being colorful and relatively drought tolerant, it’s a favorite of many homeowners ...

Every state has its own official tree, a living emblem that reflects a state’s natural heritage, character, and pride. State trees are chosen not just for their beauty, but for the role they play in ...