So we also built a concrete planter to go along the whole back corner- 50 feet long in total. After building it, adding some moulding, and filling it with dirt, we planted bamboo which grew to 15 feet tall within 2 years, and this year is hitting 29 feet. This gives us not only privacy, but the wind makes it sound like rushing water.
We also brought some cuttings of Datura trees whci we've scattered around the yard.
