Cascade Penstemon

One of the easiest penstemons to grow in the puget lowlands, tolerating more moisture and shade than most other penstemons. Deep blue to purple blooms are arranged in whorls atop 2-3′ stems in June-August. Well-drained soil. Attractive to pollinators.

Hardy to zone 6

Photo credit: Michael Wolf, Penig, CC BY-SA 3.0, via Wikimedia Commons