Overwatering: This is one of the most common mistakes gardeners make when they start growing geraniums. Underwatering. If you are afraid of overwatering your growing geraniums, you might end up giving them inadequate water.
Again, due to the many factors affecting the watering schedule, we cannot give the exact time geraniums can go without water. However, on a general view, geraniums should never be allowed to wilt or the sun to become bone dry to be watered.