I am trying to find an affordable natural alternative to roundup does anybody have some suggestions? I need something to control weeds growing up in the cracks of my driveway and around the house but also I need to do some weed control around my barn and a fence that surrounds about an acre. I have heard that using 20% vinegar will work but that stuff is not very affordable for such a large area as I am trying to control. So if anybody has some suggestions please let me know.