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Penstemon strictus |
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| | Attractive burgundy seedheads are in late July |
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| Common name |
Rocky Mountain penstemon |
| Family |
plantaginaceae |
| Life cycle |
perennial (Z4-9) |
| Flowers |
purple or blue (summer) |
| Size |
24" |
| Light |
full sun |
| Cultural notes |
well-drained soil |
From seed  |
see seed details
detailed seed-starting info below
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| Seed ripens | early August |
Nice larger penstemon, striking when in bloom. Mid-green lance-shaped leaves. Not very long-lived - I replace by growing from seed regularly. Drought resistant.
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We left this plant behind in our Pennsylvania garden (and wish it well); we don't grow it in Houston. Read about all the penstemon species in our garden About my plant portraits
PlantLinks to other web pages about Penstemon strictus
Some particularly helpful links to other websites
Visitors to this page have left the following comments| constance castro | Jan 03, 2014 | hello...I have never started penstemon "Rocky Mountain" by seed before. Is it difficult? I am an amateur. Constance
Penstemons can be difficult to start, but P. strictus isn't so bad. I found it is best to sow the seeds to just below the surface of a pot with gritty soil. Sow many more seeds than the number of plants you want – in my experience, germination rates are low. |
- Seed from '00 trade. Cellpack, 70F (35%G, 6-16d). Most seedlings succumbed to damp-off.
- Same seed as above. Baggy, 70F (20%G, 11-21d)
- Seed from '02 garden. Baggy, 70F with light (36%G, 8-20d). Several never developed after transplanting to cellpack
- Seed from '02 garden. Pot, 70F with light (16%G, 10-18d). All grew into healthy plants
- Seed from '09 garden. Surface-sown to pot under light (14%G, 10-15d)
- Same seed as above. Surface-sown to pot under light (3%G, 14d)
Germination percentage is always rather low; susceptible to problems after transplanting or wet conditions after germination. Sowing thickly to pot and leaving undisturbed until sturdy plantlets have developed seems like the best approach.
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