You wouldn’t think that mulching a tree was any big deal, but it seems that it is. Do it the wrong way and you can kill the tree. A common mistake is to create a “Mulch volcano” by adding more and more mulch each year until it forms a thick layer around the trunk. This will suffocate the roots and cause the bark to peel and eventually kill the tree. In this video from This Old House Roger Cook and Matt Foti demonstrate how the job should be done. Check out the video below.