Photo by Melody

PlantFiles: Cardwell's Penstemon
Penstemon cardwellii

Family: Plantaginaceae
Genus: Penstemon (PEN-stem-on) (Info)
Species: cardwellii (card-WELL-ee-eye) (Info)

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3 members have or want this plant for trade.

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6-12 in. (15-30 cm)

12-15 in. (30-38 cm)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:

Bloom Time:
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
From woody stem cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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By Todd_Boland
Thumbnail #1 of Penstemon cardwellii by Todd_Boland

By GardenGuyKin
Thumbnail #2 of Penstemon cardwellii by GardenGuyKin

By cg_portland
Thumbnail #3 of Penstemon cardwellii by cg_portland


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive cg_portland On Dec 16, 2011, cg_portland from Portland, OR wrote:

This is a native in the Pacific Northwest, it has done well in a predominantly dry bed under a native Garry oak and beside other PNW natives, occasional water the first summer. Mine blooms May-August

Positive Todd_Boland On Jan 22, 2005, Todd_Boland from St. John's, NL (Zone 5b) wrote:

Another member of the Dasanthera Section, this one is relatively easy to accomodate. It can take a fair amount of drought but performs better with adequate moisture. Plants form an evergreen subshrub to nearly 2 feet. Winter foliage can turn purplish. Typically the flowers are purple to blue-purple but I grow a dwarfer, reddish-pink flowered version called 'Roseus'. The blooms are relatively large.


This plant has been said to grow in the following regions:

Monmouth, Oregon
Mount Hood Parkdale, Oregon
Portland, Oregon

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