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Cardwell's Beardtongue

Penstemon cardwellii

Cardwell's Beardtongue is a pretty perennial native to the Pacific Northwest. This compact species typically grows 6 to 12 inches tall and spreads to form dense mats of small, glossy, evergreen leaves. In late spring to early summer, it produces abundant spikes of tubular, lavender to purple flowers that attract hummingbirds, bees, and butterflies. The flowers’ striking color and the plant's low, spreading habit make it ideal for rock gardens, front borders, and as a ground cover in sunny, well-drained areas.

Details

Height6” - 12”
Spread12"
Bloom SeasonMay – August
Soil Types
loamLoam
sandSand
gravelGravel
Soil Moisture
dryDry
mediumMedium
Sun Exposure
partSunPart Sun
fullSunFull Sun

Range Map

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Ecological Benefits

Maintenance Tips

  • Drought-tolerant once established; water moderately in its first growing season to establish a deep, extensive root system.
  • Deadhead spent blooms to encourage further flowering and prevent self-seeding.
  • Prefers well-drained, sandy or rocky soil; avoid waterlogged conditions to prevent root rot.
  • Apply a light layer of gravel or crushed stone to enhance drainage around the plant base and mimic its natural rocky habitat.
  • Monitor for signs of root rot or fungal diseases in overly moist conditions and manage as necessary. Provide protection from harsh winter wetness.

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