Moonflower, Datura Inoxia, Sacred Datura
This is the most beautiful and arresting plant I've ever grown. First, the framework: dark leaves with silvery veins on arching purple stalks. Buds form all over the plant, held vertically like green candles. Then one night at dusk the first one spirals open as the light fades, driving bumblebees crazy trying to get to the nectar before dark.
The pure white flowers--over 8" long and 4"wide--track the moon all night and fade by noon the next day. The scent is hypnotic and wonderful--strong but with a light citrus note too. They open most nights from mid-July til the end of September--sometimes one perfect flower, sometimes as many as 21. Plant it where you watch the moon rise.
All parts of this plant, from roots to seeds are poisonous. If you have children or pets around, you might want to snip off the "hedgehog" prickly seed pods before they split and spill (copious) seeds where a child could eat one.
Plant the seeds around the last frost date in sandy, limy soil. Be patient. Several cycles of watering and drying will wake them up. You might want to start in a pot so they don't get disturbed or forgotten. Perennial in zones 9-10, but blooms 1st year from seed and is mostly grown as an annual. 30 seeds