I just now ran an experiment, I'll report back in a day or two: I took my straight 10% vinegar out and sprayed around the cactus and agave and a few other trees and shrubs to see what the reaction would be. I am theorizing that the vinegar won't hurt the cactus, but might help get some of the grass out of the bed. And I'm curious to see how tender some of the other plants are (tree bark, etc.)

Whatever you use for spraying vinegar, make sure it's cheap, and wash it thoroughly after. Don't let it sit, the acid really eats up rubber and other pump parts.

SRS