Does rock salt work as a weed killer?

Diquat is a serious herbicide. Expensive, but it's a killer.

Diesel

Roundup

Weeds will continue to return, but reapply every so often. Easy peazy.

I have often thought about salting the spaces in my concrete driveway for the same reason. I haven’t tried it yet because I’m afraid it will runoff into my yard and do terrible things.

I have sections in my gardens that are just rocks and weeds grow up through all the rocks. Anything I can apply to the entire rock sections to prevent or kill weeds?

Would a granular type be better?

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I have sections in my gardens that are just rocks and weeds grow up through all the rocks. Anything I can apply to the entire rock sections to prevent or kill weeds?

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By chance you know what types of weeds you dealing with? I’d suggest a generic non-selective herbicide like glyphosate (“Roundup”, buy the generic brands - cheaper) to kill it off the existing weeds, and consider applying a granular pre-emergent herbicide, like “Dimension” and apply that in Sept/early Oct, and then again in late Feb/March. That will help to control annual broadleaf weeds, but not perennial weeds or sedges. Use a couple tablespoons of surfactant (spreader/sticker) in the herbicide solution.

As Zappas said, salt and vinegar solution are going to kill the foliage but not the roots. Glyphosate will kill the roots. But weed seeds that are present will continue to sprout - the pre-emergent will help tremulously with that, depending on what types of weeds you are dealing with. And course, keep up with doing this - it’s not a one time activity.

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Is there any product I can buy that will prevent anything from growing once I put it down.

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They make soil neutralizers.