The room calla (Zantedeschia) comes from the swampy regions of South Africa. During growth and especially flowering, it must always be kept moist. She doesn't get water when she's resting. The soil must dry out completely during this time.
The water requirement of the calla depends on the growth phase
Watering after growth phases
The calla lily grows in January. At this point, get the houseplant out of its winter quarters. At first, water sparingly and gradually increase the amount of water.
During the flowering period, the soil must always be well moist. The houseplant can now even tolerate occasional water in the flower saucer. Also ensure high humidity with a spray bottle.
After flowering, let the potting soil dry out. It's not cast anymore. The humidity must not be too high either.
tips and tricks
The calla likes soft water. Use rainwater or let tap water sit for some time.