Tweedy's Lewisia

Lewisiopsis tweedyi

Montiaceae

• Washington State Native 
• Full sun to light shade
• 6"–12" tall × 6"–10" wide
  
• Drought Tolerant: Yes — highly drought tolerant once established; requires excellent drainage
• Evergreen: Yes — semi-evergreen
• Flower: Apricot, peachy-pink, and white; (April–June)
• Attracts native bees and early-season pollinators
  

Tweedy's Lewisia is the sole species in genus Lewisiopsis and is considered one of the most beautiful alpine and subalpine rock garden plants in North America. Its natural habitat spans rocky slopes, cliff faces, and talus fields in the Wenatchee Mountains and Cascades of central Washington and adjacent British Columbia, growing in well-drained rocky or gravelly soils with a distinctly continental climate — cold, snowy winters and hot, dry summers. In cultivation it demands superb drainage, particularly in winter when moisture around the crown can cause fatal rot. A rocky slope, raised bed, crevice garden, or container planting are ideal situations. It performs well in Spokane's climate when sited correctly.

The plant forms a large, lustrous rosette of fleshy, spoon-shaped dark green leaves that are attractive year-round. In spring, branching flower stems rise above the foliage carrying multiple blooms in exquisite pastel tones — typically peachy apricot to soft pink, often with faint yellow veining on the petals — though color varies across individual plants from nearly white to deep rose. The flowers are large for the plant's size, funnel-shaped, and have a soft satiny sheen. Named for Frank Tweedy, a US Geological Survey botanist who collected specimens near Mount Stuart in the 1890s, it was once classified as Lewisia tweedyi and Cistanthe tweedyi before recent molecular work placed it in its own monotypic genus.

Lewisiopsis tweedyi has limited documented ethnobotanical history, reflecting its specialized alpine habitat and relatively restricted range. Its primary ecological role is as an early-season nectar source in rocky mountain environments where floral resources are scarce in late spring. Specialist native bees and early-flying pollinators visit the flowers. The plant's succulent leaves and deep taproot enable it to persist through summer drought and to withstand the freeze-thaw cycles of its native montane habitat. It is listed as a plant of conservation interest in British Columbia due to its limited range.

In garden use, Tweedy's Lewisia is best treated as a featured specimen in a rock garden, crevice garden, or alpine trough where its specific drainage needs can be met and its exceptional beauty can be showcased. It combines beautifully with Bitterroot (Lewisia rediviva), Cutleaf Daisy (Erigeron compositus), Wild Blue Flax (Linum lewisii), and low-growing sedums. A top-dressing of gravel around the crown helps ensure moisture moves away from the rosette. Avoid clay soils and sites with standing winter moisture. Container culture in a gritty, lean mix is an excellent alternative that allows the gardener to move the plant under cover during the wettest winter periods.