Bed under a shade tree
I have a large Maple in my back yard. I have made a circular bed with River Rock. My island in front and other beds are all made with river rock also, so I want to keep with the design.
My question is this: The grass will be killed out and removed from the bed. Since it is under a tree I plan on planting hosta and shade loving plants. Do I dig down some in the earth or do I use a synthetic mesh material in the bottom? If I use the mesh then the earth up to the top of the river rock will only be 6 inches at the best. Will this be enough earth since the roots will not be able to penetrate the mesh material?.
Thanks for your help.