Crassula Tom Thumb is the perfect succulent for mini gardens, terrariums, or succulent projects! She is very aware of how colors work together, how to make the size of everything feel balanced and proprotioned, and finishes off with perfect accents. Moon Cactus is a desert cactus from South America, mainly Argentina, and can vary in not only the shape it takes but also the color and size. It was larger around the succulents and medium-sized just outside. The majority was about the size of coarse soil. The wooden planter boxes are surrounded by succulents.