Crassula muscosa, commonly known as Watch Chain, is a slow-growing succulent native to rocky outcrops and shrublands in South Africa and Namibia. It reaches a modest height of 6-8 inches and features very small, light green leaves densely packed around thin stems, creating a unique square appearance. The plant is characterized by its intricate, bushy form and the interlocking leaves that resemble the links of a chain or a zipper, hence the common names Zipper Plant and Princess Pines.

Watch Chain is valued for its unique texture and form, making it a popular choice for rock gardens, container plantings, and as a ground cover in xeriscapes. It requires minimal maintenance and is drought-tolerant once established. In cultivation, it prefers a well-draining soil mix, typically a combination of potting soil and sand, and thrives in bright, indirect light. It should be watered sparingly in winter and more frequently during the growing season in summer. Overwatering can lead to root rot, so ensuring proper drainage is essential. Watch Chain produces small, yellow-green flowers, although it is primarily grown for its foliage. Propagation is easily achieved through stem cuttings, which root readily. Gardeners should be cautious as it can become invasive in suitable climates if not contained.CC BY-SA 4.0