Make sure your mum in a sunny area and keep the soil moist, but do not saturate. Giving your plants too much water will result in rotting stems and mushy, decaying blooms. Deadhead as needed by removing any dead or damaged flowers, leaves, and stems when necessary to keep your mum looking fresh and healthy. If a frost is expected, move the mums to a protected inside area such as a garage, shed or barn in the evening, before the temperature drops. Place the plants back outside when the temperature rises above 50 degrees the next day. Alternatively, you can cover the potted plants with old towels or sheets to protect from the frost, taking care to cover all exposed areas of the plant.