Hell No, We Ain't Gonna Mow - Veggie Gardens and Landscape Timbers

Last night G found literature at the local Home Depot that says that we should not be using pressure treated lumber anywhere near food (it's treated with a copper compound that can leach out), so there goes our primary idea for the vegetable garden terraces.  Plan B is installation of those heavy concrete blocks like our neighbor used - cheaper, yes, but also more work.

Here's the area that we're going to be working on  all staked out.  It's about a 30-45 degree slope that is a pain in the rear to mow.