If bringing outdoor plants indoors to protect them from the cold winter months is out of the question, plant them in the ground instead. Leaving container plants in their pots -- plastic, ceramic or terra cotta -- is a guaranteed death sentence. As the temperatures dip, their roots will freeze, and even the hardiest of plants will die. If it’s impossible to transfer them into the ground, transfer your container plants to a warmer area, like a garage, and cover them with burlap or an old bed sheet. Come spring, your plants will thrive and bring you beautiful flowers.