Many people look at trees to relax, taking in the soothing fractal patterns to adjust their eyes from too many hours spent at a computer. Dominick "Dom" Ciruzzi, assistant professor of geology at ...

Q. I heard that we shouldn’t plant a tree of heaven because it’s invasive and host to some invasive pest species. Could you explain? The tree of heaven (Ailanthus altissima) is native to China but has ...

Tree of heaven is a fast-growing invasive species that has taken hold in many parts of the U.S. Tree of heaven, a noxious weed and invasive tree, is making an indelible mark on the Pacific Northwest — ...