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Annual Nicotiana ‘Perfume Purple’ will bloom all summer long. The 20-inch plants are loaded with dark-purple, star-shaped flowers. ‘Perfume Purple’ grows in full sun or part-shade:
‘Ceasar’s Brother’ is a Siberian Iris with purple flowers that grows 36 to 48 inches tall on strong stems in late spring/early summer. The plants perform best in moist, fertile soil:
Lisianthus ‘Echo Blue’ is an annual that grows 12 to 24 inches tall with bluish-purple flowers. Lisianthus is a notoriously fussy plant to grow from seed, so I buy plants from the garden center in the spring: