Q: What’s happening to the bark on our six apple trees? In summer, I wrapped plastic around the trunks and put on sticky stuff to catch climbing insects. I realize now that wasn’t the best move, ...

Why do trees have bark? Julien, age 6, Melbourne. This is a great question, Julien. We are so familiar with bark on trees, that most of us just take it for granted. But bark is one of the most complex ...

The center of a tree or shrub stem (from roots to trunk, branches, and twigs) is woody, composed of xylem cells that conduct water from the roots to the upper parts of the tree. That woody section is ...

As Colorado experiences its signature whiplash weather, arborists are warning that stressed trees are more vulnerable to pests and diseases. Peel back the bark, and you may find a predator in your ...