Until the late nineteenth century, Finland's isolation required that most farmers concentrate on producing grains to meet the country's basic food needs. In the fall, farmers planted rye; in the spring, southern and central farmers started oats, while northern farmers seeded barley. Farms also grew small quantities of potatoes, other root crops, and legumes. Nevertheless, the total area under cultivation was still small. Cattle grazed in the summer and consumed hay in the winter. Essentially self-sufficient, Finland engaged in very limited agricultural trade.