Penstemon serrulatus

CASCADE BEARDTONGUE, COAST PENSTEMON, SERRULATE PENSTEMON
syn. n/a
Family: Plantaginaceae
Pronounced: PEN-stoo-mon ser-roo-LAH-tus

 

Quick Jumps

Growing Guide
Rainy Side Notes

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GROWING GUIDE

Origin:
Alaska to Oregon.
Plant Group:
Perennials
Hardiness:
Sunset zones: Not listed.
USDA zones: 3-9.
Heat zones: 9-1.
Mature size:
Height: 20 inches.
Width: 12 inches.
Flowering period:
Midsummer to fall.
Flowering attributes:
Tight clusters at the top of the stems hold deep blue, pinkish-purple, or pinkish-red, tubular, one-inch long flowers born on one-sided panicles, or false whorls.
Leaf attributes:
Semi-evergreen, ovate to lanceolate, glossy, sharp-toothed, pungent, dark green leaves.
Growth habit:
Tall, upright subshrub.
Light:
Partial shade to full sun.
Soil:
Moist soil, well-drained soil.
Feeding:
Provide a complete organic fertilizer in spring.
Propagation Methods:
Sow seed in fall and place in cold frame for winter.
Take cuttings in August and place in a sand medium. Winter over in a frost free greenhouse or coldframe.
Pruning Methods:
N/A

 

Rainy Side Notes

Of the 52 or so penstemon varieties that grow in the Pacific Northwest, most of them are native to alpine regions, or rocky outcroppings. Almost all penstemons need full sun and sharp drainage. However, Penstemon serrulatus is one of the few that tolerate wet soil. Even though considered drought tolerant, the species thrives on regular irrigation and withstands perpetual winter wet soil.

This native inhabits areas from coastal to sub alpine regions in meadows, next to streams, vernal wet areas, riparian Forests, and bottomland forests. Although some references consider it to be shade tolerant, it grows best with at least partial shade to full sun.

With a long summer flowering period, this midsummer to fall bloomer is an excellent choice for the border and containers. Be aware. On warm humid days, the pungent leaves release a most unpleasant odor. Plant them well away from your deck and other seating areas, unless you enjoy a fresh dog doo fragrance.

Wildlife

Penstemon serrulatus is an excellent nectar source for Hummingbirds and other pollinators.

Debbie Teashon