Certain trees, naturally prone to having shallow roots, lose oxygen and die when they are covered by thick flower beds . Some herbicides designed to kill the roots of weeds can have a devastating effect on the tree's root system. Dicamba is one example of a root-killing herbicide that could damage a tree if misplaced. But too much mulch can cut the roots off from water and oxygen. Though several factors can disrupt a tree's root system, one of those things is not other trees.
Trees can coexist near one another without causing damage.
Aker said he recommends planting a small tree near an older tree, so the area will not be left vacant when the tree dies. Whether your tree is for shade, or a barrier for air, sound or pollution, or a habitat for birds and wildlife, it is a value to the owner and the property, said Aker.