I have a 4 footer, and yes, you can go through some thick stuff....but basically, If it's over an inch in diameter, I cut it first. Sumacs can be tough. I'll use long handled pruners for stuff between 1-2", and the chain saw for the rest. The reason I cut it first is for safety. First off...it's dangerous when big chunks of wood are flying out of your mower....VERY DANGEROUS! Also, it beats up the driveline. Second, is the fact that if the brush is that high, you run the risk of getting pulled off the tractor by the brush. This probably wouldn't be on my short list of good ways to die...! If the brush hog can lop off limbs from trees, I'm sure it wouldn't have much trouble with your arms, legs or head. If that sounds scary, I meant it. I read in the paper all the time about knuckleheads who didn't use common sense for a split second, and it cost them and their loved ones dearly. My advice is....trim the Sumacs to a reasonable height...brushhog em the rest of the way, and then keep em short by brush hoggin once a month. In a few years they'll give up. Good Luck Steve
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