Rock Mat
Petrophytum caespitosum
A resilient, mat-forming alpine shrub perfect for rocky crevices.
- Plant Type
- Perennials & Annuals
- Width
- 2-3 Ft.
- Height
- 4-12 In.
- USDA hardiness zone
- 3 - 9
- Sun requirements
- Full Sun, Part Shade
- Design image count
- 3
Design images (3)
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Create design onlineAbout Rock Mat
Petrophytum caespitosum, commonly known as mat rock spiraea, is a resilient woody perennial native to the mountainous regions of the western United States. This plant forms dense, prostrate carpets of blue-green foliage that expertly hug limestone outcrops and cliff faces. In the summer months, it produces distinctive, bottle-brush spikes of small white flowers. It is highly drought-tolerant and prefers well-drained, rocky soils, making it an ideal candidate for alpine gardens and rock crevices.