Rocky Mountain Penstemon

Penstemon strictus

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



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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:

Unknown - Tell us

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


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

Ottawa, Kansas

Helena, Montana

Carson City, Nevada

Pahrump, 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

show all

Gardeners' Notes:


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.


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 t... read more


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.