I have a 30 acre pasture that is overgrown with very long grass that the horses could not eat up last year. It is also very weedy, with a lot of cockleburs and burdocks. What should I do with this pasture? Pull the current weeds and then spray? Bush hog the grass down to a good level? Bush hog the whole thing? Burn it? How long would it take to come back to be able to be grazed on if we burnt it off? Any suggestions appreciated!!