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for killing weeds around food crops, there are few things that work better than vinegar!
There's an organic vinegar/something else mix called burnout, which kills everything it touches very quickly.... you can use normal white vinegar on small weeds as long as you coat the surface of the leaves... mix it with a little soap to act as a surfactant and get it to spread all over.
You can also use vinegar to acidify the soil in places you never want to grow again, like driveway cracks and gravel driveways and whatnot. Once you want the area to grow again, mix in some dolomitic limestone or other basic-ph-adjuster and yer back in business!
Just be careful applying the stuff, as it doesn't discriminate between weeds, grasses, and good plants. You can also upset the soil pH by allowing too much on the soil, but it's easily corrected by mixing in dolomite lime.
Nothing can discriminate between weeds and good plants, actually, because the ones that don't kill lawns work by targeting a specific hormone only present in dichot plants (weeds and flowers) which isn't there in monochot plants... to tell if something's a dichot or monochot, look at the veins on the leaves - if they're parallel, it's a monochot, and if they branch outwards or run into each other, it's a dichot and will be killed by that kind of poison.
The above is a guideline, not a rule, so if you've got something you really care about, make sure to look it up. And never use those herbicides near food crops.
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And that, my liege, is how we know the Earth to be
banana-shaped.
This new learning amazes me, Sir Bedevere. Explain again
how sheeps' bladders may be employed to prevent earthquakes.
Oh, certainly, sir.
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