Place the cement lawn ornament in a location that maintains a temperature above 50 degrees Fahrenheit. Temperatures lower than this can interfere with the curing process.
Feel the surface of the lawn ornament with your hand to see if it still feels damp to the touch. If it is completely dry, spray a fine mist of water over the surface of the entire lawn ornament until it is moist.
Place a plastic tarp over the lawn ornament and make sure that the tarp extends all the way to the ground.
Allow the concrete lawn ornament to sit covered for five to seven days to cure. Then remove the plastic tarp and place the lawn ornament in the desired location in the garden.