Petrophytum cinerascens, commonly known as Chelan rockmat, is a unique and hardy perennial plant adapted to harsh, rocky environments. This compact, mat-forming species belongs to the rose family (Rosaceae) and is particularly known for its ability to thrive in crevices of exposed cliffs, making it a fascinating specimen for rock gardens and alpine collections.

Petrophytum cinerascens grows slowly but steadily, spreading out in mats that can cover several feet of rocky surface. It tends to grow in horizontal layers, tightly clinging to rocks, which makes it ideal for planting in rockeries or on the edges of retaining walls. If you can keep Lewisiopsis tweedyi and Douglasia nivalis happy, this one will do great for you!

This plant is endemic to the Chelan County in Washington state, where it grows naturally in dry, rocky outcrops, cliffs, and talus slopes. It is highly drought-tolerant and well-suited for xeriscaping. In cultivation, it requires well-drained, gritty soil and full sun to thrive. Its ability to survive in nutrient-poor, exposed conditions makes it a great choice for rock gardens, alpine settings, and other minimalist landscapes.