Penstemon cobaea
Penstemon cobaea is a striking native perennial with large tubular flowers in shades of white, pink, and violet that rise above sturdy upright stems in late spring. Its bold flowers and coarse green foliage give it a strong presence in sunny gardens while its water wise nature makes it especially useful for dry and rocky sites.
Height & Spread: 1 - 2 ft x 1 - 1.5 ft
Bloom Time: Late spring to early summer
Light Requirements: Full sun
Soil Preference: Dry to average well drained soil; tolerates poor and rocky conditions
Watering Needs: Low; drought tolerant once established
Deer Resistance: Deer resistant
Native Status
Penstemon cobaea is native to the central and south central United States where it occurs naturally in prairies, rocky bluffs, limestone glades, and other dry open habitats.
WILDLIFE & INSECTS
Hummingbirds
- Draws hummingbirds to its large tubular flowers which provide accessible nectar during the late spring bloom period.
Butterflies
- Attracts butterflies seeking nectar from its showy flowers and adds valuable early season resources to pollinator gardens.
Bees
- Supports native bees including specialized bees which forage within the deep floral tubes for nectar and pollen.
Spacing & Landscape Use
Spacing Recommendations
- Space 12 - 18 in apart to give each upright clump room to develop while allowing the large flowers to stand out individually.
Landscape Placement
- Ideal for native plantings, prairie gardens, rock gardens, and sunny borders where its large flowers provide an eye catching spring display.
Companion Plants
- Asclepias tuberosa (Butterfly Weed) - Adds vivid orange flowers and strong pollinator value as the season moves into summer.
- Coreopsis verticillata 'Zagreb' (Threadleaf Coreopsis) - Provides airy foliage and bright yellow flowers that complement the bold form of Penstemon.
- Echinacea purpurea (Purple Coneflower) - Continues the pollinator display with larger flowers as Penstemon finishes blooming.
- Schizachyrium scoparium (Little Bluestem) - Adds upright grass texture and warm seasonal color while sharing Penstemon's preference for dry well drained soil.
- Solidago nemoralis (Gray Goldenrod) - Extends the flowering season with golden blooms that complement its dry site conditions.