PatWentworth":5dhdp2ic said:Why try to kill the weeds? Let the cattle graze them down. If the weeds aren't allowed to bloom, they won't be back as most "weeds" are annuals.
Check out http://www.youtube.com/watch?v=dANLnHEi19A. (Cows Eat Weeds.)
Thistles and other especially obnoxious weeds can be grazed heavily if you spot spray the weeds (or weed patch) with molasses.
Molasses is cheaper and you don't have to spray the entire field or paddock - just the weeds you want to control.
Once you've sprayed a certain type of weed 2 or 3 times with molasses, the cattle will seek these weeds out first - without them being sprayed - it's just a matter of teaching them to like different plants.
Pat that's a very interesting video! Have you tried it? I've got these dang little sweetgum trees about knee high that I cut/sprayed/cursed all last summer. I've seen the cows nibble on them from time to time. I'm thinking I may give this a try...