Trees clean water. The leaves of the tree shall be for the healing of the peoples. Shocking, but true. So don't plant hydrocarbon producing trees like Carrotwood or Liquidambar, nor allergy-pollen trees like the Olive. But God giveth the increase.
Property values increase min.
5 minutes exposure to trees reduces stress by changing blood pressure and muscle tension. The state tree is the Redwood. And the C.S.S.C.A.R. President comes from a county named for a tree.