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This is derived from the habits of the Vietnamese and Chinese who always put its the fruit between the tail of the green dragon statue because believe it was brought blessing and also the red color of the fruit skin looks conspicuous among the green dragon statue and since then this fruit is called thang loy and by other countries who speak English translated into dragon fruit because All over the skin filled with tassels analogous to dragon scales

Oh and why are dragon fruits so expensive??? RM4 per fruit maaannn

maybe, taking care of dragon fruit is difficult, not many who plant dragon fruit, or high market demand is not proportional to its production capabilities. And dragon fruits don't easy to rot even if stored for a long time. And it could be also because the dragon fruit believed was brought blessing by chinesean. But, what do you think, why so expensive?