I am about to get a wonderful free workout from raking three acres of leaves. Some will be piled onto the cardboard lawn to garden project, while others I would like to pile under my mature trees. I am confused on the mulching under trees. I have read that certain mulching can harm the tree roots because of weight and mold. I have many trees where roots are exposed, if I have researched correctly, I believe I want to remedy that. My goal is to not have the weedy type plants growing under the trees such as Canadian Goldenrod and even grass. (I do love the golden rod, they are welcome in many other places) I would like to eventually plant the circle of beneficial companions. Do I need to do something more helpful in ridding what I don't want before piling on the leaves? Would cardboard or packing paper be harmful if layered under the leaves? I am assuming I want air flow and very light mulch on the roots, yes?
I have several trees that have a ground cover of Glechoma headeracea, which I am happy with. Would a light leaf mulching be fine and not harm the ground cover?
Thank you so much,