Lithops are small, succulent plants that store water in their leaves. They are native to dry regions of Africa and can survive long periods without water. When they do need water, they will generally start to show signs of stress. The leaves may begin to wrinkle or pucker, and the plant may start to shrink. If you see these signs, it's time to water your lithops. To water your lithops, first, check the soil. If it is dry several inches down, then it is time to water. Lithops prefer infrequent, deep watering rather than frequent shallow watering. Water the plant until the soil is thoroughly moistened and allow it to drain well. Avoid getting water on the leaves, as this can cause them to rot. Allow the soil to dry out completely before watering again. With proper care, your lithops should thrive and remain healthy for many years.