Just 3 simple steps: Pour quick-set concrete into the mold on any flat surface. Smooth with a trowel. Wait one minute, lift mold and move on. This mold measures 20 inches x 24 inches x 2 inches, and holds one 60 pound bag of premix concrete.
Make cement cloth planters. Approximately a water/cement ratio. Add drainage holes in the planter before it completely hardens to prevent cracking. You may also want to apply a couple coats of cement sealer after the planter is dry.