Showy penstamon (Penstemon spectabilis)

Showy penstemon (Penstemon spectabilis) lives up to its name, being the showiest of the penstemons. It grows fast, reaching 2 to 4 feet tall and 3 to 4 feet wide. This perennial bears spectacular wide-mouthed, tubular violet or purple-blue flowers from its first year on. In good conditions it may flower late winter into summer. Showy penstemon is beautiful and easy to grow. It likes full sun and tolerates a variety of soils, including clay. If planted in an area that holds water better, it usually doesn't need supplementary summer water. The plant will flower more abundantly with occasional summer water (once per month) but may be shorter lived. It is fairly short lived even under the best of circumstances, typically lasting 5 to 10 years. However, it often self seeds. This deer-resistant plant is great for wildlife, attracting a variety of native bees and hummingbirds for nectar. It is a larval host for a likely total of 13 butterfly and moth species. From Calscape.