Cotton, tobacco, bunch of stuff. Anything that grew in the ground really, as long as it made a profit.
sugar
A large southern crop that grew only one crop
Sugar cane was, and still is, the primary crop grown at Oak Alley Plantation. For more, see the related link below.
plantation
corn
A large farm that grows mainly one crop to sell is called a plantation. Plantations have been existing since the Roman Empire. An example of their plantation is the latifundia. It produces wine and oil for export.
The man who was in charge of ensuring a profitable crop for a plantation master was called overseer. The most powerful weapon the plantation masters had was the threat of sale.
Rice
corn
TEA
Sugar cane is a tall perennial grass, originally native to tropical Southeast Asia.
there is not that much plantation