30 - 40 cm
July - August
well drained, gritty
acid - neutral - alkaline
fairly hardy, given right conditions
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.
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.
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.