The best cooling benefit for a condenser would be shade from near by bushes and shade from trees. Even though the unit itself's radiant heat absorption is minimal the surroundings are another question. The surrounding bushes will absorb some heat from the ambient air from their moisture content as well as add some moisture to the air before it reaches the condenser giving the air a better heat absorption rate.
How effective this is, is up for debate but there is some benefit. You just don't want to get the bushes too close or have trees that shed too much near the unit that could help clog the coil.