Nicotiana sylvestris. This flowering tobacco stands regally in the garden at 1-1.5m (3-5′) tall, with a cascading head of pure white, tubular flowers that attract moths and hummingbirds. Grown as an annual, or short-lived, tender perennial, Nicotiana may self-sow and is hardy in Zones 2-10. It looks splendid among other tall flowering plants such as Agastache and foxgloves. Grow Only the Lonely Nicotiana seeds in a warm spot in your garden, in full sun. Pollinated by moths, this Nicotiana’s flowers become particularly fragrant after dusk, so plant some near a window and let the scent waft in during summer.