How Often Change Plant Water. Why are weekly water changes important for. Watering in the morning will help the water evaporate and leaves the plant less likely to suffer from fungal diseases at night.
Potted plants need to be watered more frequently than plants in the ground, but how often to water them depends on the type of plant, the size of the pot, the. Water is available once a week during the winter and twice a week when the weather turns warm and dry. But a ph that shifts from 5.0 to 7.5 between water changes can really hurt your plants.