Queen of the Night (Epiphyllum oxypetalum)

Catching a glimpse of this cactus’ blooms, also known as Kadupul flowers, takes a fair bit of patience. Not only do the plants rarely bloom, but the flowers emerge at night and wither by dawn. While the plants are native to Mexico and South America, you can grow them indoors. Additionally, cultivated plants have escaped and can now be found throughout countries like Sri Lanka.