Agriculture is the main industry that is carried out over the Canterbury plains. The main crops grown are wheat, barley, various strains of clover and other grasses for seed exporting. Besides growing these crops, it also created various processing and distribution businesses in Christchurch. In recent years, agriculture has expanded to the wine industry and olive production and processing. Deer farming has led to new processing using antlers for Asian medicine and aphrodisiacs. Also, dairy farming and raising stock are also carried out on the flourishing Canterbury plains. Other industries include manufacturing, real estate and wholesale business. In more recent years, sightseeing and tourism have become prosperous, led by tourists from Europe, Asia, and North America.