Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Plantaginaceae
Native
Colorado, Wyoming, New Mexico, Arizona, Utah
Life Cycle
Perennial
Plant Height
Tall (Greater than 24")
Flower Color
Blue
Bloom Season
Early summer
Further Information
Plant Characteristics
- Attracts Hummingbirds
- Attracts Pollinators
- Cut Flower
Growing Conditions
- Drought Tolerant
- Heat Tolerant
Plant Resistance
Deer Resistant
About Rocky Mountain Blue Penstemon Seeds
Penstemon strictus
Brilliant, 1" blue-violet, tubular flowers
Planting Penstemon
Plant Spacing
A group of 3 seeds every 18"
Hardiness Zones
4, 5, 6, 7, 8, 9
Light Required
Full sun to part shade
Plant Height
Tall (Greater than 24")
Planting Depth
⅛"
Planting Details
| Seed Depth | ⅛" |
|---|---|
| Seed Spacing | A group of 3 seeds every 18" |
| Thinning | When 2" tall, thin to one every 18" |
| Germination | 14–35 days |
| Start Indoors | 6 to 8 weeks before your average last frost date. Germinates best in cooler soils (near 55°F). |
| Direct Sow | 6 to 8 weeks before your average last frost date or late fall. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
Send Your Recommendation
Total 5 star reviews: 14 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 2
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Rating
16 reviews
- Rebecca H.Verified BuyerRated 5 out of 5 stars4/23/26Happy so far
I winter sowed these as well as did a cold stratification and typical indoor sow. Both methods had good germination. Can't speak to the flowers themselves yet, but I'm happy with germination rates. Picture of winter sown seedlings in April zone 7b. Also of note, the 8 week cold stratification suggested on the packaging was as least a month longer than required. I noted germination in the winter sown jug and found that my refrigerated seedlings were already germinating after a month.
Which best describes you as a gardener? IntermediateBIBotanical Interests5/3/26Hey Rebecca,
We love to hear your Rocky Mountain Blue Penstemon Seeds are growing so well using multiple methods! It sounds like you really know your way around seed starting! Thank you for sharing that helpful tip about the stratification timing too - it's great feedback that germination started happening after just a month rather than the full 8 weeks. Your fellow gardeners will definitely appreciate that insight! We can't wait for you to see those gorgeous blue blooms when they arrive - Rocky Mountain Blue Penstemon flowers are absolutely stunning and such fantastic pollinator magnets! Keep on growing 🌻️
- Valerie D.Verified BuyerRated 5 out of 5 stars9/16/25Blue penstemon
Looked great in my flower bed! The color is amazing.
Which best describes you as a gardener? BeginnerBIBotanical Interests9/16/25Hey Valerie D.,
What a wonderful review! We're so thrilled to hear that your Rocky Mountain Blue Penstemon looked absolutely fantastic in your flower bed!
That amazing color you mentioned is exactly what makes this variety so special - those vibrant blue blooms really know how to make a statement in the garden! There's something so striking about that true blue color that just catches your eye and draws you right in. It sounds like they found the perfect home in your flower bed!
Thank you so much for sharing your positive experience with these beautiful penstemons. Your review will be so helpful for other gardeners who are looking to add some stunning blue color to their own gardens!
Keep on growing 🌻️
- Keifer B.Verified BuyerRated 5 out of 5 stars6/9/245 Stars
Love you guys, great products!
Which best describes you as a gardener? Intermediate - Michelle M.Rated 5 out of 5 stars5/17/245 Stars
I grew this in some milk jugs for winter sowing last year then transplanted them to a raised garden bed. They were very leafy and healthy but no flowers. I almost forgot what they were. This season they came roaring back and now have flowered out beautifully. It's taller than my kindergartener. I'm going to move it to another more permanent part of my yard. I hope I don't kill it by doing that but this bad boy is getting big. I still can't believe it came from a seed packet. Highly recommend just be patient.
Which best describes you as a gardener? Beginner - Shraddha S.Rated 5 out of 5 stars5/6/245 Stars
Beautiful perrenial for zone 6 garden. I grew the seedlings with wintersowing method 2 years ago. The colors are so pretty. Extremely easy to grow, and thrives on neglect. Does well withh drought and poor soil.
Which best describes you as a gardener? Intermediate