Speaking of bushes, and trees: In the dear dead days beyond recall, I interviewed a professor at University of New Hampshire (founded as a Land Grant College and very big on the environment) who said something I have never forgotten : he said that it takes four trees to replenish the oxygen for the average family. In those days (statistically) Mom, Dad and 2 1/2 children.
Since then have bought homes where requisite number of trees was present, or immediately planted a couple!

How does your tree-garden grow?