Citrus ripening The citrus season begins this month, with some oranges ready to be checked for ripeness. Here, an at-a-glance chart of orange and grapefruit varieties by month of earliest ripening.

Citrus fruit rind color has long been used as an indicator of ripeness, but for some fruits such as mandarin fruit in the Chongqing region of China, the peel and flesh do not ripen synchronously ...