Besides using potatoes for starch, Aroostook County farmers discovered they also grew great seed potatoes and that soon became an important part of their business.
Starch factories prospered as well, with 62 in Aroostook County in 1904.
In 1930, Aroostook County was the leading producer of certified seed potatoes in the U.S. and the leading producer of starch in the U.S. and Canada.