I am trying to build a rectangular wooden planter box up against a backyard wall, but the wall's footing is above the ground and differs in height at different points along the wall. The picture below shows the wall footing.
The left side of the footing is a whole cinder block higher than it is on the right side (about 6" difference in height).
The planter box will be rectangular and 4-sided. I've thought about raising the ground height of this area until it's above the footing, or cutting the wood to conform to the general shape of the footing, or simply moving the planter box away from the wall far enough to avoid the footing. All of these options have pros and cons.
What's the best way to deal with the issue of the protruding wall footing?