Citrus
kumquat, and shaddock, widely cultivated for fruit or grown as an ornamental. It is believed that citrus plants are native to subtropical and tropical [...] from these warmer climates they are not frost hardy. Temperatures not falling below −2 °C (28 °F) are required for successful cultivation. Theses trees thrive [...] varieties include oranges, grapefruit, lemons, and tangerines and to a lesser extent, tangelos. Oranges account for the greatest value in terms of production;