Penstemon Species, Cascade Penstemon, Beard Tongue, Pride of the Mountain

Penstemonserrulatus

Genus
Penstemon (PEN-stem-on)
Species
serrulatus (ser-yoo-LAY-tus)
Synonym
Penstemon diffusus
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Herbaceous
Smooth
Textured
Height
18-24 in. (45-60 cm)
Spacing
12-15 in. (30-38 cm)
Hardiness
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
Bloom Color
Magenta (pink-purple)
Medium Purple
Bloom Time
Mid Summer
Other Details
Category
Alpines and Rock Gardens
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
Patent Information
Propagation Methods
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
Seed Collecting
Allow seedheads to dry on plants; remove and collect seeds
Regional

This plant is said to grow outdoors in the following regions:

MOUNT HOOD PARKDALE, Oregon

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Gardener's Notes:

1
positive
0
neutral
0
negative
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T
St. John's, NL (Zone 5b) | January 2005 | positive

This is a semi-evergreen species that is relatively short-lived (3-4 years) but plants will self-seed if allowed so the display can be pe...Read More

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