Borax works great just sprinkle on whatever you want to kill and lasts a while great for brick patios. Lots less toxic than round-up. If you are trying to kill vegetation along a fence pour used motor oil along the fenceline. Another idea is to buy one of those propane torches specifically for killing weeds, I wouldn't recommend burning poisin ivy.
It is not particularly environmentally friendly, but Round Up will kill all vegetation. Sometimes it doesn't totally eradicate deep rooted perennials, but it gets rid of grass and all broadleafed weeds.
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