The reason is that as the temperatures rise in the southern summer, the betel nuts ripen more rapidly. Those that ripen too quickly become fibrous, making them less pleasantly crispy than betel nuts from Chiayi or Nantou. Pingtung therefore stops producing in October, when Chiayi and Nantou begin to harvest in volume.
原因是南部的檳榔入夏後隨著氣溫升高而快速成長，以致後期採收的纖維多，口感不如嘉義、南投的爽脆，因此一旦 10 月嘉義、南投開始量產，屏東就會停產。