Allendan Seed Company

Penstemon grandiflorus - Large-flowered Beardtongue

Large-flowered Beardtongue - Penstemon grandiflorus
SKU: 114
Return Policy

Large-flowered Beardtongue (Penstemon grandiflorus) is a showy perennial with unbranched, smooth stems, and opposite, blue-green, waxy clasping leaves. The large, two inch lavender, tubular flowers extend horizontally on short stalks from the axils of leafy bracts towards the top of the stem. Its bloom time is somewhat short, 2 - 3 weeks in May or June, but its attractive foliage make it a beautiful plant especially grown in masses all season long. It is an endangered plant in some states, and it is not often found growing in the wild.


Soil Moisture:  Dry

Sun Exposure:  Full Sun

Height:  2' - 4'

Spread:  1'

Hardiness Zone:  3 - 7

Bloom Color:  Lavender

Bloom Time:  May, June

Attracts:  Butterflies, Hummingbirds, Pollinators



Penstemon is a large genus of flowering plants with approximately 280 different species that are native to only North and Central America. Most penstemons have a durable woody stem, opposite leaves, and tubular shaped flowers. Its most distinctive feature is a prominent hairy staminode visible in the mouth of the corolla, which gives the general appearance of an open mouth with a fuzzy tongue, hence the common name "beardtongue." Penstemons are quite hardy, and are often used in xeriscape landscaping, as many species are native to desert or alpine regions.

Return Policy

Returns of standard seed mixes and individual species must be made in the original unopened packaging within 10 days of delivery. If you wish to return live plants, you must do so within 5 days of delivery. Returns of standard mixes, individual species, and live plants are subject to a restocking fee of 25%. Custom seed mixes may not be returned. When returning non-damaged goods, the buyer is responsible for shipping charges, and return shipping may be made by whatever means the buyer selects.

Allendan Seed Company warrants that the seed it sells will conform to the label description as required under state and federal seed laws. The seed labels show independent lab testing results, and the absence of weed seed is not represented or guaranteed. It makes no warranties, expressed or implied, of merchantability, fitness for purpose, or otherwise, which would extend beyond such descriptions. In any event its liability for breach of any warranty or contract with respect to such seed or plants is limited to the purchase price only. Allendan Seed Company further limits to the purchase price any liability of any kind on account of any negligence whatsoever on its part with respect to such seed or plants. By acceptance of the seed or plants, the buyer acknowledges that the limitations and disclaimers herein described are conditions of sale and that they constitute the entire agreement between the parties regarding warranty or any other liability.

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