The String of Pearls Plants should be watered relatively infrequently, as the plants like to dry out some between watering. The easiest way to tell if a plant needs to be watered is by the weight of the container. If the container is very heavy and the foliage is upright, chances are good the plant doesn't need water, whereas a light container and limp foliage means the plant needs some water. Sometimes, water pours out of the container without being retained by the soil. Soaking the dry soil in a small dish or saucer can be a useful way to solve this problem. It is important not to water the foliage of these plants, or to over-water them as this will lead to leaf damage or plant death. If you're unsure, it is always better to let the plant go dry instead of drenching it with water. Moisture meters are another easy way to tell if plants need to be watered, and usually come with a guide to indicate what number or level of moisture different plants require.