Native Habitat:
Rocky slopes, cliff faces, and well-drained talus areas in the Cascade Mountains and nearby ranges of the Pacific Northwest, including regions east of the Willamette Valley. Often found in crevices with excellent drainage and partial protection from intense sun.
 
Bloom Time:
May – July
 
Growth Habit & Mature Size:
Low-growing perennial, typically 4–10 inches tall and spreading 8–16 inches wide. Forms basal rosettes of fleshy green leaves and produces large, showy, satiny flowers ranging from apricot to peach-pink with darker veins.
 
Light & Soil Requirements:
Partial sun to light shade; thrives in sharply drained, rocky or sandy soils. Sensitive to winter wet conditions around the crown and benefits from protection from excessive moisture. Adapted to dry summer conditions.
 
Willamette Valley Native Companion Plants:
Sedum spathulifolium, Eriogonum umbellatum, Arctostaphylos uva-ursi, Festuca idahoensis, Penstemon davidsonii, Phlox diffusa.
 
Urban Garden Function:
A striking focal plant for rock gardens, alpine beds, and well-drained container plantings. Its vivid flowers and compact rosette form provide seasonal color and sculptural interest in small-scale native plant designs.
 
Wildlife Supported:
Flowers attract native bees and small pollinating insects. Early summer bloom provides nectar resources in rocky and alpine habitats where floral resources may be limited.
 
Historical Use:
Discovered in the late 19th century and named in honor of Frank Tweedy, a Pacific Northwest plant collector. Highly valued in horticulture for its large, luminous flowers and suitability in alpine and rock garden plantings.