The soil in flower pots can sometimes become covered with a white coating.
Most often, the problem can be noticed during the cold season.
The problem most often appears due to high humidity, dry air, and improper watering.
The reason may also be that the tap water is too hard.
If a coating has appeared, the affected layer of soil must be removed. The remaining soil must be carefully loosened.
It would also be a good idea to wipe the walls of the pot with a damp sponge.
In the future, the rules of care need to be revised.
For example, plants should be watered only with filtered water.
It is important to monitor the amount of fertilizers, do not overdo it. If you want to use fertilizers, it is important to strictly follow the instructions.
If not only a white coating but also mold is found in the flowerpot, the plant should be transplanted into a new pot with fresh soil.