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Penstemon serrulatus

Penstemon serrulatus

Common name Cascade penstemon
Family plantaginaceae
Life cycle perennial
Flowers purple (summer)
Size 18-24"
Light sun-part shade
Cultural notes ordinary garden soil (not too dry)

Shrubby perennial, native to the Pacific Northwestern United States. Despite several successful attempts to grow it from seed, I have yet to get plants through the subsequent summer and winter to observe a second-year plant. So I finally decided to at least take a snapshot of a first-year seedling to have something to show on this page. The leaves are finely serrated (as the species name would suggest), and have purple undersides. I'm hopeful that my luck will turn this year, so that I can see some flowers next year.

This plant used to grow in our garden, but it slipped away...

Read about all the penstemon species in our garden

About my plant portraits
PlantLinks to other web pages about Penstemon serrulatus

Seed-starting details for this plant

  1. Seed from '05 trade. Pot outside Jan 30, with grit covering seed. ~65%G by May
  2. Same seed as above. Baggy 35F (12w; 7%G, 12w) - 70F (47%G, 1-6d)
  3. Same seed as above. Baggy 35F (12w; 45%G, 9-12w) - 70F (25%G, 3-6d)
  4. Seed from '10 trade. Baggy 35F (57%G, 8-12w)
  5. Same seed as above. Baggy 35F (60%G, 6-11w)

Clothier lists this as germinating at cold conditions with light requirement. My trials suggest that cold conditioning is helpful, but that for some seed batches more germination occurs when temperatures increase; light, while perhaps helpful, does not appear to be necessary.

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