In the winter, if a planter is to remain planted, they should be raised up off the ground making sure not to block the drainage hole. This allows the planter to drain and will prevent the planter from freezing to the ground. If the planter is not to be planted, it should be brought inside to a garage or shed. If this is not possible, follow the steps above, but turn the planter upside down to prevent it from filling with snow and ice. It should then be covered or wrapped with burlap or any absorbent material and then wrapped with dark plastic to prevent it from accumulating moisture.