Sugar cane is a tall tropical plant. It is grown for the sugar that can be obtained from its thick stems.
sugar cane in British English
or sugarcane (ˈʃʊɡəˌkeɪn)
noun
a coarse perennial grass, Saccharum officinarum, of Old World tropical regions, having tall stout canes that yield sugar: widely cultivated in tropical regions
Compare sugar beet
sugar cane in American English
a very tall, perennial, tropical grass (Saccharum officinarum) cultivated as the main source of sugar