Place a plastic planter upside down in the center of a tree stump’s surface. Trace around the planter’s outside edge with a pencil. The outline indicates the portion of the stump that needs to be removed.
Drill holes about 1 inch apart inside the pencil outline on the stump’s surface. Make the holes about 1/2 inch wide, and drill them to the full depth of the drill bit. Cover the space inside the pencil outline with the holes.
Fill the holes with water. Allow the water to soak into the stump’s wood overnight. The water will soften the wood.
Position a chisel’s blade at a 45-degree angle on the edge of one hole you drilled. Hit the other end of the chisel with a hammer or mallet. The action will remove a chunk of wood from the stump. Continue chiseling wood from the stump until its entire center is hollowed out.
Place the plastic planter in the hollowed out hole to ensure it fits. Chisel out more wood from around the hole’s edges if necessary to make the planter fit in the hole. If you want the planter to sit deeper in the stump, repeat the drilling and chiseling procedure until the hole is the proper depth.
Sand the stump’s top and inside the hole to make them smooth by rubbing them with rough-grade sandpaper. Sanding removes dangerous splinters and rough spots but leaves a rustic, natural appearance.
Drill holes from the stump’s sides into the hole that is in the stump’s center. Drill a series of the holes around the stump. They will serve as drainage holes.
Place the plastic planter in the stump’s center hole. Fill the planter with potting soil to within 1 inch of the planter’s top edge. Plant flowering plant seeds or seedlings in the potting soil, and water the soil. Care for the flowering plants by following the directions on their seed packets or nursery pot tags.