Answer: There are only a few night blooming plants, and based upon your description, I'd say your friend is growing a Cereus. As indicated by the name, the blooms appear at night and soon close after the day starts. Bloom time is late spring to early summer. The very large white fragrant flowers adorn the plant. Individual flower are 14 inches long by 12 inches across ... very showy! If pollinated, they produce edible red fruits up to 5 inches long. You can take a cutting from your friend's plant to start your own, or you can purchase one from a garden center dealing in desert tropicals. In the meantime, enjoy!
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