To make your own concrete flowerpot, choose two containers of different sizes to serve as molds. The ingredients to use include cement and vermiculite. Other materials or tools include a pair of gloves, sheet metal, a paintbrush, cooking oil, sand paper and a drill. Put the cement mixture in the large container, and push in the smaller container. Let the mixture dry for about 48 hours, and remove the molds.
Before pouring the cement, use a paintbrush to coat the inside of the larger container with cooking oil and the outside of the smaller container to facilitate removal once the mixture sets. Use gloves to produce a mixture consisting of 1 part cement and 4 parts vermiculite. Add water slowly to the mixture to produce a fine-consistency cement. Use vermiculite or sand in the cement mixture, although sand significantly increases the weight of the flowerpots.
Fill the larger container with the mixture, and leave about an inch of space at the top. Tap the container gently to eliminate air bubbles, and push the smaller mold into the larger one, making sure to leave adequate thickness for the pot’s bottom. Replace any displaced mixture into the bucket, and cover the top of the mold with sheet metal.
Flip the containers, and move them back and forth to even the surface of the pot before leaving the mixture for 24 to 48 hours to dry. Once dry, remove the molds gently, and sand the rough edges for an even, smooth finish. Drill holes at the bottom to facilitate drainage of the flowerpot.