Water sparingly in winter but keep the soil slightly moist at all times, the Myrtle do not tolerate dryness of the root ball at any time of year. The rule of thumb for watering: the brighter and the warmer the conditions the more water is needed. Mist plants often. Heating systems can dry out air and plants. If leaves curl or drop, your plant was dry for too long. Toss it, as myrtles rarely survive once they've completely dried out.

Cut back new growth on young Myrtles to two to three leaves when it reaches 4 inches long. Pruning can be done any time but is best performed during the rest period, especially if you want flowers.