Fifth place: Sri Lankan cactus flower Value: priceless
The flowering time of the Sri Lankan cactus flower is not at all regular, which tells you that it is unlikely to see the flowering, and it only blooms for an hour or two at night, so if you want to see it blooming you will have to rely on fate, or spend the whole summer squatting. Because its flowers are so fascinating and rare, almost like a species that appears in mythology, and has never been put up for sale, it has become a "priceless treasure".
