Here is the final assembly of the 8-sided flower pot.
Cut a 1/8" deep saw cut on the outside,
1" from the top and bottom of each piece. A rubber band or wire can be placed in this grove to hold it together while the joints are secured.
With the assembly made, the joints should be glued.
Turn the pot on its side and press down just enough to open a joint inside. Then insert wood glue (waterproof recommended).
Continue until all joints have glue inserted and let dry overnight.
To install a bottom, just set the flower pot over some wood and trace the bottom pattern. Then cut outside this line about the thickness of the material used. You will need to have the blade tilted to whatever angle you made the wall angle of the flower pot.