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Grab the edges of the smaller container and pull it out of the concrete. If you covered it with a plastic bag, it should come out fairly easily. Peel away any plastic that may have stuck to the inside of the larger mold. If you're having trouble getting the small mold out, you can use a crowbar to pry it out of the larger mold. If you sprayed the inside with cooking spray, the planter should slide out. If you used a cardboard box, peel away the sides and bottom of the box to reveal the concrete planter. If you're having trouble getting the planter out, don't be scared to break the larger mold. You can superglue stones, decorative glass, or beads to the outside of the planter to give it a more colorful look. You can use masonry paint to paint the outside of the planter if you want it to be a different color.  Before you paint the planter with masonry paint, put a coat of block primer on the planter so that you have a flat surface to work on.  You can use stencils to paint specific images onto your planters. Tape the stencil to the side of the planter and fill in the gaps with masonry paint. in the planter. Fill the interior of the planter with potting mix and plant whatever flower or houseplant that you want. You may want to amend and replace the soil once a month to keep your plant alive and healthy. You can also grow a new plant by planting a seed in the pot.

Summary:
Pull out the smaller mold. Flip the planter over and lift up the larger container. Decorate the outside of the planter to personalize it. Plant your indoor or outdoor plant