Stop in for a cup of coffee

Tree stumps. Landscaper friend on mine told me for the small ones 6-8" size, drill numerous 1" holes into the stump vertically and fill them with pool acid. Cover it after with something to keep the critters out and refill the holes for a week or so. Doesn't take all that much acid to do so. It rots the roots off and the stump just takes a little tug and out it comes.