A close-up of an oak leaf with bumps, or galls, from the gall wasp, Photo courtesy Getty Images. Welcome to our tree column, “Ask your local arborist.” Each month, arborists from the Davey Tree Expert ...

Waiting until the leaves drop in fall is a rule of thumb for pruning shade trees, mainly because you can see bare limbs better, and the job is less “messy” without leaves attached to the cut branches.

Find out which type of oak trees to plant, plus the benefits they offer to your landscape and the environment.

Add Yahoo as a preferred source to see more of our stories on Google. Large oak tree in front of nice neighborhood Oak trees have been around for more than 50 million years, with individual trees ...

Many coast live oak (Quercus agrifolia) trees are showing unusual browning in their canopies in the last month or two. If you look carefully, you may see small, crescent-shaped galls forming on the ...