Penstemon hirsutus – Eastern Penstemon
Perennial. Zone 3. Plantaginaceae, formerly Scrophulariaceae. Syn. Penstemon pubescens. A.k.a. HAIRY BEARD-TONGUE. North America. In Canada, from Ontario eastward. The entire plant – leaves, stems, buds, flowers – is entirely covered by tiny, silky hairs, hence the Latin and common names.
Penstemon hirsutus – detail of buds and flowers showing tiny, silky hairs.
Penstemon hirsutus is an attractive North American wildflower which is widely grown in gardens. There are numerous forms, including a dwarf type, Penstemon hirsutus ‘pygmaeus’, which is very popular in alpine gardens. Colours may range from pure white through pale lavender to rosy tones – but the most common is the blushed lavender pictured above.
This Penstemon is a quietly elegant, rather understated plant. The foliage clumps are attractive, being composed of smooth, satin-textured, dark green, lanceolate leaves. Its roots are rhizomatous, and the plant slowly expands from its center. Penstemon hirsutus is completely non-invasive. Mature plants may be carefully divided and replanted in early spring to prolong the plant’s life, as they can get quite woody and die off in the centers.
Penstemon hirsutus – Eastern Penstemon – in the mixed perennial border. Image: Vesna Maric
Slender stems arise in early summer, 18 to 30 inches tall. These are lined with loosely arranged whorls of small, pale-purple-flushed-with-darker-highlights, tubular flowers in late June through July. The buds and flowers have a silken sheen which rewards a closer look.
A rather beautiful plant, though not at all what one could call “showy”. I am fond of it, for its ease of growth and self-sufficiency – no need of staking or pruning or any sort of fussing – and its profuse blooms, always alive with bees. All of the Penstemons are great hummingbird favourites, and this species is no exception.
Penstemon hirsutus is happy in any average garden soil. It is drought tolerant and can be used in xeriscape plantings, but will get larger and bloom more with at least a bit of supplemental moisture in the hottest months of summer. Full sun is best, though it can tolerate part-day light shade. A pleasant front-of-border plant.
Penstemon hirsutus in full bloom stage, mid-summer.
A rosy-purple Penstemon hirsutus coming to the end of its bloom time – Williams Lake, B.C. – July 2014. Image: HFN
