The first step in the process of tree placement is to look at all the other woody plants on the property. This can be done with a legal pad and a #2 pencil, or by using the latest landscape design software. In the end, the step of acknowledging the existence and size of the plants already in place is much more important than the tool used. The key is to simply note, mark, or describe through a rough sketch where specific plants are and how much space they take up.

Through this inventory process, “holes” or “gaps” in the landscape are identified. Open spaces don’t necessarily mean that a tree/shrub must be planted there, but it’s a good start. In addition to a gap or space, an existing tree in poor condition should be considered as a “hole,” in that it needs to be removed, and thus, an empty space for a new tree will be created.

Source: https://www.turfmagazine.com/all-tree-services/tree-services-feature-for-a-thriving-tree-location-is-key/