But greater altitude doesn ’ t necessarily correspond to better-quality tea. “ The real key is the day-night temperature differential, ” he explains. Lan says that the best Taiwanese teas grow at an elevation of about 1,500 meters at locations near the Tropic of Cancer, where there is a day-night temperature differential of 18 ° C, i.e.
「日夜溫差大才是重點，」他指出，最好的台灣茶生長在海拔高度 1,500 公尺、北回歸線附近、日夜溫差達攝氏 18 度，如阿里山的石卓、竹崎等茶區；而當海拔高度達 2,500 公尺時，基本上溫度太低、光照不夠，茶樹連存活的養分都不足，哪有餘力散發什麼香氣？