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Penstemon strictus

Penstemon strictus
Rocky Mountain penstemon
Attractive burgundy seedheads are in late July
Penstemon strictus

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
Seed ripensearly 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.

Rocky Mountain penstemon

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

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Seed-starting details for this plant

  1. Seed from '00 trade. Cellpack, 70F (35%G, 6-16d). Most seedlings succumbed to damp-off.
  2. Same seed as above. Baggy, 70F (20%G, 11-21d)
  3. Seed from '02 garden. Baggy, 70F with light (36%G, 8-20d). Several never developed after transplanting to cellpack
  4. Seed from '02 garden. Pot, 70F with light (16%G, 10-18d). All grew into healthy plants
  5. Seed from '09 garden. Surface-sown to pot under light (14%G, 10-15d)
  6. 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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