Mums (chrysanthemums) should be watered whenever they need it, with soil kept moist but not waterlogged. For potted mums, check soil moisture daily, watering whenever the pot feels light or the soil surface is dry, which can mean watering every day in warm weather or every few days as it cools. Garden- planted mums usually need less frequent watering, about once a week, to maintain deep soil moisture but not allow the soil to dry out completely. Overall, the key is to monitor soil moisture closely and water to keep the soil evenly moist without saturation to prevent root rot and encourage healthy blooms.