Choose a flowerpot or bowl smaller than the stump you have chosen. The pot should fit easily into the stump, once it is hollowed out, with the top of the pot being flush or a little below the top of the stump.
Cut the stump off to the desired height, using the handsaw or chainsaw, as closely to the ground as possible. If you are planning to use the stump indoors, or in a different area, ensure you cut the base of the stump evenly across the bottom so that the stump flowerpot has a flat bottom surface.
Trace a circle on top of the stump, using the widest portion of the flowerpot or bowl that you have chosen as a guide, with a pencil or chalk.
Drill holes in the top of the stump, using the traced circle as a guide. The drilled holes should be approximately 2 to 3 inches apart. Drill the holes directly inside the circle to allow for easier removal of the center of the stump.
Chisel out the center portion of the stump using the hammer and the wood chisel. If the stump is rotten, the center may be soft enough to use a spoon to remove the unwanted section of the stump. Be sure to remove any jagged edges that may prevent your pot from fitting smoothly into the stump. The pot or bowl should fit easily into the hole and should fit flush with the top of the stump.
Paint the entire stump with wood preservative, using the paintbrush, to create a long-lasting pot. Paint the inside of the stump as well to prevent the stump from decaying on the inside. Allow the stump to dry completely before placing the container into the stump.
Place your flowerpot or bowl into the stump.
Glue the dried or artificial moss around the bottom of the tree trunk using the hot glue gun. If using real moss, remove all the dirt from the roots of the moss and allow it to dry.