Hello all, This vinegar suggeston reminds me of the method we used in the sixties for controlling on a field scale, weeds in onion crops with a diluted mixture of sulphuric acid ( H2SO4). Very efficient on small weeds, but only a setback effect on older weeds. The problem was that acid resistant equipment was necessary and handling the acid was a very delicate affair. In a small scale highly diluted swimming pool acid will have the same results. Greetings Lauw de Jager South of France http://www.bulbargence.com/ -----Original Message----- vinegar potion only kills the tops of undesired plants... "weeds" are best dealt with near the end of the growing season when they have used up all their resources.