argh, cat sent that off too soon.......
Here is a better explanation from :
http://www.garden.org/weedlibrary/?q=show&id=2415
Soap-based herbicides dehydrate leaves by cutting through their
protective layer of cutin. All of these types of organic herbicides work
best on young weeds and pose only a temporary setback to well-rooted
perennial weeds. To minimize damage to neighboring plants, spray only in
dry, still weather. To maximize effectiveness, spray young weeds when
temperatures are above 70 degrees F and the sun is shining brightly. Be
aware that repeated applications of a product containing acetic acid
(which is very strong vinegar) can lower the soil's pH, making it more
acidic.
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MaryBeth
Jan Leitschuh wrote:
