Sung Ching-yun points out that you can only grow peaches in an area which enjoys over 600 hours of temperature under 7 ℃ per year. Over 800 hours are required to grow pears, and over 1000 hours before you can grow apples.
宋慶雲指出，每年在攝氏七度以下的溫度共達六百小時以上的地區才能種桃子、水蜜桃，達八百個小時以上地區才能種梨，一千小時才能種蘋果。