Rocky Knoll Farm
Penstemon Sour Grapes
Deep purple tubular blossoms stand out against the rich green foliage of this bold penstemon. Sour Grapes is a favorite among butterflies, hummingbirds and bees alike, and it usually blooms throughout the summer. This perennial likes lots of sun, only needs occasional watering once established and is great for floral arrangements. Cut back expired flower heads to encourage more blooms throughout the season. Generally grows to about 2' tall and 18" wide. Hardy to 0°F when protected from windchill.