Mulching around trees?
So, over the last few weeks I've posted some pictures in the "name that plant" forum of trees that I didn't know what they were. In addition to all the great comments I received about the IDs, many also suggested I mulch around all of my trees. I have one Magnolia (~12ft tall), one Asian Dogwood (~10ft), 2 Bradford Pears (~20ft) and one oak (~30ft). At this point, should I be mulching around these trees as others suggested? And if so, how far around should eyes and how deep? And one more question, what do I need to do to prepare the ground that will be mulched? Do I just kills all the grass, then pull it up, put weed barrier down and then mulch? Thanks!!!