Penstemon 'Rocky Mountain' DescriptionBotanical Name: Penstemon strictus Native to Colorado and Wyoming. Leaves are dark green,opposite, simple, oblanceolate to lanceolate, 1 1/2" to 2" long, 1/2" to 3/4" wide. 2' tall spikes with dark, violet-blue, tubular blooms. Plant CharacteristicsPlant Category: PerennialsName: Penstemon 'Rocky Mountain'Plant Type: Perennial Flower: Dark, violet-blue, tubular blooms, 1 1/4" long Mature Size: 3' x 2' Water: Low Exposure:: Full sun Spacing: 1'Soil Type: Clay; loam; sand; alkaline; well drained Planting Time: Any season CommentsA very long-lived penstemon.