South Dakota Native Plant Research
Penstemon grandiflorus

Scientific Name

Penstemon grandiflorus


Download Seed: The seeds of large beardtongue are brown and 2.5-4 mm long. (66 KB)

Download Seedling: One month old seedling grown in research greenhouse at SDSU. (77 KB)

Download Vegetative: The leaves of large beardtongue are entire and 3-16 mm long. (71 KB)

Download Flowering: The purple flower of large beardtongue is bilabiate. (47 KB)

Download Fruiting: Capsules develop in mid to late summer and are 14-20 mm long. (79 KB)

Download Research garden: First seasons growth of beardtongue planted in research garden near SDSU. (82 KB)

Family Name


Common Name

Large beardtongue

Native American Name

Lakota: Kimimila tawanatica


Penstemon grandiflorus is a(n) perennial herbaceous, which grows 5 dm to 9.5 dm in height. This species is commonly found sandy to loamy prairie soils. The leaves are basal. Penstemon grandiflorus has pink pale blue flowers that bloom from April to July.

Additional Notes

The Lakota name means butterfly’s flower

Horticulture Notes

Seed Collection: Collect seed in June-July
Germination: Scarification
Vegetative Propagation: Division of rootstock and summer cuttings
Soils: Rich, well drained, sandy, or gravelly
Light: Full sun
Water: Prefers moisture
Notes: Doesn't survive outside it's native region

Penstemon grandiflorus