Besides its branches, roots, and leaves, a mature tree also grows another important structure—the flower (or cone, in the case of evergreens). Flowers are the reproductive structures from which ...

Grey Tree by Piet Mondrian, 1911. [Image: Kunstmuseum Den Haag] Fundamental research in the biology of branching helps cure cardiovascular diseases and cancer, design materials that can heal ...

Trees looking a bit brown in places? It's probably the 17-year cicadas laying eggs. What you need to know about flagging, and ...