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Rocky Mountain Penstemon is a western classic, bearing tall spikes of violet-blue flowers that withstand cold, drought, and poor soils. A dependable perennial that fills wild gardens with color.
Water Needs: Low; drought-tolerant once established
Sun Needs: Full sun
Soil Requirements: Well-drained, sandy or gravelly soils
Growing Zone: USDA Zones 3–8
Cold Hardiness: Down to ~–40°F (–40°C)
Mature Size: 2–3 ft tall x 1–2 ft wide
Native Origin: Rocky Mountains, USA
Best Substitutes For: Wasatch Penstemon, Blue Flax
Landscape Uses: Meadows, xeric gardens, pollinator plantings
Rocky Mountain Penstemon is a western classic, bearing tall spikes of violet-blue flowers that withstand cold, drought, and poor soils. A dependable perennial that fills wild gardens with color.
Water Needs: Low; drought-tolerant once established
Sun Needs: Full sun
Soil Requirements: Well-drained, sandy or gravelly soils
Growing Zone: USDA Zones 3–8
Cold Hardiness: Down to ~–40°F (–40°C)
Mature Size: 2–3 ft tall x 1–2 ft wide
Native Origin: Rocky Mountains, USA
Best Substitutes For: Wasatch Penstemon, Blue Flax
Landscape Uses: Meadows, xeric gardens, pollinator plantings