Adding moss to an exterior garden is a beautiful way to enhance its appearance, and with this easy and inexpensive recipe, you’ll enjoy growing moss as well. Growing exterior garden moss on a variety of objects is relatively simple. There are a number of basic techniques you can use to grow moss, ranging from creating a moss mixture which you can paint onto surfaces like flagstones and wooden benches to transplanting sheets of moss into shady areas in your garden. Once established, moss requires little care beyond being kept moist. Keep in mind that moss grows slowly, so try not to be impatient while you grow moss.