Crassula perforata, commonly known as String of Buttons, is a perennial succulent native to the rocky outcrops and slopes within the arid and semi-arid regions of the Cape Provinces and KwaZulu-Natal in South Africa. It typically forms sprawling clusters reaching up to 18 inches (45 cm) in height, with stems densely packed with triangular, stacked leaves that resemble a string of buttons. The leaves are gray-green with edges that may turn pink or red when exposed to sunlight. It blooms in spring to early summer, producing small, inconspicuous cream to pale yellow flowers that are not particularly showy.

String of Buttons is valued for its unique geometric leaf arrangement and ease of care, making it an excellent choice for rock gardens, container plantings, and as part of succulent collections. It requires minimal maintenance and is drought-tolerant once established. In cultivation, it prefers a well-draining cactus or succulent potting mix and full sun to partial shade. Overwatering can lead to root rot, so it is important to allow the soil to dry out between waterings. It can be propagated easily from stem cuttings or leaves, which root readily. While generally pest-resistant, mealybugs and scale insects can sometimes be a problem.CC BY-SA 4.0