Moss tissue does not have cells that move water. This means that they are non-vascular plants. Water must soak into mosses like a sponge. A patch of moss is made of many tiny moss plants packed together so that they can hold water for as long as possible. They do not have roots. Because mosses cannot find water, they live in two ways. They can live in places that are always wet like near a spring, a river, or in a place where there is a lot of fog. They can also pause their natural processes when they dry up. Mosses can survive months in this paused state. However, they eventually need water to live. This means they can never live in dry places like deserts.