Serrulate Penstemon, Serrulate Beardtongue, Cascade Penstemon, Cascade Beardtongue, Coast Penstemon, Coast Beardtongue, Penstemon diffusus
Penstemon serrulatus (Cascade Penstemon) is a semi-evergreen subshrub with several ascending to erect stems boasting dense, one-sided clusters of deep blue to purple, trumpet-shaped flowers in early to late summer. The blossoms attract bees, hummingbirds, and numerous pollinators. Arising from a woody base, the stems are clad with glossy, oval to lance-shaped, dark green leaves that are conspicuously toothed on the margin. Cascade Penstemon is native to moist woods and rock faces of the humid transition zone west of the Cascade Mountain crest. It is considered to be one of the most adaptable penstemons and is cold tolerant.
| Hardiness |
3 - 9 |
|---|---|
| Heat Zones |
1 - 9 |
| Plant Type | Shrubs |
| Plant Family | Plantaginaceae |
| Genus | Penstemon |
| Common names | Penstemon, Beardtongue |
| Exposure | Full Sun |
| Season of Interest |
Summer (Early, Mid, Late) |
| Height |
1' - 2' (30cm - 60cm) |
| Spread |
10" - 1' (25cm - 30cm) |
| Spacing | 12" (30cm) |
| Maintenance | Low |
| Water Needs | Average, High |
| Soil Type | Chalk, Clay, Loam, Sand |
| Soil pH | Acid, Alkaline, Neutral |
| Soil Drainage | Moist but Well-Drained |
| Characteristics | Showy, Semi-Evergreen |
| Native Plants | United States, Alaska, Pacific Northwest, Oregon, Washington |
| Attracts | Bees, Birds, Hummingbirds |
| Garden Uses | Beds And Borders, Ponds And Streams |
| Garden Styles | Informal and Cottage |
| Hardiness |
3 - 9 |
|---|---|
| Heat Zones |
1 - 9 |
| Plant Type | Shrubs |
| Plant Family | Plantaginaceae |
| Genus | Penstemon |
| Common names | Penstemon, Beardtongue |
| Exposure | Full Sun |
| Season of Interest |
Summer (Early, Mid, Late) |
| Height |
1' - 2' (30cm - 60cm) |
| Spread |
10" - 1' (25cm - 30cm) |
| Spacing | 12" (30cm) |
| Maintenance | Low |
| Water Needs | Average, High |
| Soil Type | Chalk, Clay, Loam, Sand |
| Soil pH | Acid, Alkaline, Neutral |
| Soil Drainage | Moist but Well-Drained |
| Characteristics | Showy, Semi-Evergreen |
| Native Plants | United States, Alaska, Pacific Northwest, Oregon, Washington |
| Attracts | Bees, Birds, Hummingbirds |
| Garden Uses | Beds And Borders, Ponds And Streams |
| Garden Styles | Informal and Cottage |
How many Penstemon serrulatus (Cascade Penstemon) do I need for my garden?
| Plant | Quantity | |
|---|---|---|
| Penstemon serrulatus (Cascade Penstemon) | N/A | Buy Plants |
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Create a membership account to save your garden designs and to view them on any device.
Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.
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