Top 10 most rare flowers and what makes them special

4. Night-blooming cereus – only flowers once a year
This flower only blooms once a year.
Credit: commonswikimedia.org
While the plant itself isn’t rare, this one is on our list of the most rare plants in the world because it only produces flowers one night a year.

It produces white flowers that are star-shaped and beautiful and seeing them bloom just one day of the year is something you don’t want to miss.
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