Photo by Melody

PlantFiles: Rocky Mountain Penstemon
Penstemon strictus

Family: Plantaginaceae
Genus: Penstemon (PEN-stem-on) (Info)
Species: strictus (STRIK-tus) (Info)

7 vendors have this plant for sale.

31 members have or want this plant for trade.


24-36 in. (60-90 cm)

18-24 in. (45-60 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
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)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:

Bloom Time:
Late Spring/Early Summer


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

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:

Propagation Methods:
From herbaceous 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
Properly cleaned, seed can be successfully stored

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3 positives
No neutrals
No negatives

Gardeners' Notes:

Positive tcs1366 On Oct 23, 2013, tcs1366 from Leesburg, FL (Zone 9b) wrote:

Grew this Penstemon by seed in Jan of 2011. Took a long time to germinate, but well worth the wait.

The plant quickly grew, and now, 2 yrs later it is a very large plant.

Was not able to get a good image of it, but the blooms are a beautiful purplish-blue.

Collected a lot of seeds and hope to grow more.

Hope this can grow in central FLA, where I'm moving in 2 yrs.

Positive MiniPonyFarmer On May 30, 2010, MiniPonyFarmer from Gilmer, TX (Zone 8b) wrote:

I ordered three of these from Bluestone and have been happy with their performance. The first year, I got only foliage, but all appeared healthy. I must have rearranged their full sun bed 3 times and moved them each time. They never missed a beat each time I moved them. In my blistering hot and humid East Texas location, these plants received almost no water, and no shade. Yet, they looked great. The second year, I moved them once again to a new location for design purposes. Again, these plants never even blinked and then sent up tall spikes with blooms. What gorgeous blooms! Bees love them! They are a vivid intense purple with a sheen of electric blue on the tiny trumpet/bell shaped flowers. The clump of foliage stays low and small, and the spikes are about 30" tall. I found that it was better to place them about 10" apart, more closely than you might expect. I ordered 6 more this month!

Positive LilyLover_UT On Jan 17, 2005, LilyLover_UT from Ogden, UT (Zone 5b) wrote:

Rocky Mountain penstemon is very striking with its deep violet-blue flowers on tall stems. It's one of the easiest penstemons to grow, although it prefers well-drained soil. It attracts hummingbirds and beneficial insects.

Start the seeds indoors, and stratify them for best germination.


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

Wasilla, Alaska
Colorado Springs, Colorado
Denver, Colorado (2 reports)
Hotchkiss, Colorado
Kiowa, Colorado
Parker, Colorado
Itasca, Illinois
Indianapolis, Indiana
Helena, Montana
Carson City, Nevada
Albuquerque, New Mexico
Farmington, New Mexico
Las Cruces, New Mexico
Rodeo, New Mexico
Elba, New York
Pottersville, New York
Elizabeth City, North Carolina
Coos Bay, Oregon
Mount Hood Parkdale, Oregon
Allentown, Pennsylvania
Austin, Texas
Gilmer, Texas
Lewisville, Texas
Wichita Falls, Texas
Ogden, Utah
Riverton, Utah
Salt Lake City, Utah
Santaquin, Utah
Essex Junction, Vermont
Leesburg, Virginia
Kalama, Washington
Bayfield, Wisconsin
Kinnear, Wyoming
Riverton, Wyoming

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