Concrete planters are always the best ones due to the minimalist style they show and the fact that they are suitable both for the indoors and outdoors and blend into the landscape in a naturally cool way that layers of terra cotta pots just don’t. To make these planters just mix the concrete, spray your outer mold with cooking spray and fill with concrete. Spray your inner mold with cooking spray and press into the middle in order to create the negative space of your planter. Use a cork – cut in half – to create the hole in the mold. The concrete takes 4 days to set. For a more rustic look add pebbles to make air bubbles and enjoy!