Regular household vinegar is a 5% acetic acid concentration. While this works on some weeds, a greater concentration is needed for other or more mature weeds. By distilling, a 15% concentration can be obtained, and a 30% concentration can be obtained by freeze evaporation. These concentrated acetic acids, if they are derived from plant sources and not from chemicals, are acceptable for agricultural use by the organic community.

That is not correct down here, in that Howard Garrett, my organic guru, says the 20 or 30 percent is OVERKILL and you're wasting your money to buy those more concentrated varieties. 10% pickling vinegar is what he considers optimum for most gardener's operations. And be sure it isn't petroleum based. The research on killing weeds around corn is interesting, though, and I expect Howard will report on these things as he hears about them. www.dirtdoctor.com.

Spray it on in WARM Weather. It isn't nearly so effective when it's cool out. And you will probably have to go back over it again because it burns the leaves, it doesn't kill the roots. You have to knock a plant down a couple of times to kill it.

Lovely afternoon, I'm preparing to mow for a couple of hours. Both the front and the back need it.

SRS