Crassula 'Tom Thumb' is the perfect succulent for miniature gardens, terrariums, and succulent projects! She is acutely aware of the interplay of colors and how they can be arranged to create a balanced look. Moon Cactus, a South American desert cactus, is mostly Argentina. It can take many shapes and also vary in size and color. You can see that the succulents are larger in the middle, while the ones further out were medium-sized. And then there was the large majority, which was similar to coarse sand. All the wooden planter boxes have succulents around them, particularly at the corners.