I have a project where trees, shrubs and groundcovers will be used. While the area coverage of shrubs and groundcovers is relatively easy to calculate, trees are a bit more tricky. Quite a bit of the trees in the landscape plan are native/adapted and several units of each will be used. How can I calculate the area coverage of trees? Is it by canopy spread? Pot size in liters (then convert to sq. meters?
Also, can non-native but adapted species of vegetation be used as long as they are non-invasive?