I checked on the Roundup web site and if you use their normal Super Concentrate, you only have to wait a few days before it's safe to plant edibles. They have a nastier version that's for poison ivy and persistent shrubs, but you have to wait a whole year if you use it. I personally would go with the Roundup. The only reason I tried the salt and vinegar treatment was that it was an area accessible to my dog. I used straight vinegar and table salt and it killed off the grass and weeds for about the same length of time as normal Roundup.
