One of my community garden members uses table salt straight out of the package to sprinkle on weeds and then slowly waters it in (not boiling water). She said it works better if you salt the weed and then let the rain get to it. I've seen her results and it works very well on thistle and other big weeds.

Salting soil in my opinion is a dangerous way to cope with weeds, because often nothing else will grow in the soil for a good long while.

Lucille, you're probably right but in our case, in the community garden, she's just spot treating one weed at a time, those that come up in bricked or mulched pathways. She pulls those that come up in beds.

I use Remedy Ultra for broadleaf weeds and add Roundup with it if I want complete kill including grass. Spectracide makes some quart sized weed killers that work great also and is less expensive and can be used in and around gardens.