Once the plant has fully bloomed, it is not necessary to water it every day. It must be watered every 3-5 days. If you stop watering it for too long, it will turn into a Whitered Plant. If you do not water it within approximately 2 days, the plant will die and only an Empty Flower Pot will remain.
If you use an Ice Flower Seeds on any fully grown plant, it will never need to be watered and the plant will never die.