Penstemon pennellianus, commonly known as Blue Mountain penstemon, is a perennial herb native to the subalpine zones and open forests of the Blue Mountains in Washington and Oregon. It is typically found in specific counties including Columbia, Garfield, Asotin, Umatilla, Union, Wallowa, and Grant. This plant grows 8 to 24 inches tall and features narrow, oblong basal leaves. From late spring to early summer, it produces striking blue or purple flowers that are densely clustered towards the top of the stems, offering a showy display that attracts pollinators such as bees and hummingbirds.

Blue Mountain penstemon is valued for its vibrant flower color and its ability to thrive in challenging conditions, making it a suitable choice for rock gardens, native plant gardens, and wildflower meadows. It is drought-tolerant once established and prefers well-drained, rocky or gravelly soils. For optimal growth, it should be planted in full sun to part shade. While generally low-maintenance, it can be susceptible to root rot if overwatered or planted in poorly drained soils. This species is not known for aggressive roots or significant disease problems, but slugs and snails may occasionally feed on the foliage.CC BY-SA 4.0