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Penstemon whippleanus
Whipple's Penstemon
Plantaginaceae
Height
30 - 40 cm
Flower colour
dark purpule
Flowering time
July - August
Foliage colour
dark green
Sunlight
sun
Soil
well drained, gritty
pH
acid - neutral - alkaline
Hardiness
fairly hardy, given right conditions
Plant range
Rocky Mountains
Penstemon is a genus in the family Plantaginaceae. It is a large genus native to N-America. They are usually low growing herbaceous plants or sub-shrubs with irregularly shaped flowers. They prefer full sun and many are well suited to rock gardens.
Propagation:
Division in spring.
Seed - sown in January.
Seed just covered and stored at 20°C (68°F) until germination. If there is no germination in 3 - 4 weeks, a 2-4 week cooling period can be helpful before returning to 20°C (68°F) until germination.
Or
Seed sown in fall and stored outside until spring, then brought to 20°C (68°F) for germination.
Needs well drained soil and a sunny spot.
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