145-160 Days to maturity. Gossypium hirsutum. Treated American Upland Cotton Seeds. Non-GMO, heirloom, annual or perennial. American Upland is the most popular variety of cotton in the world, as nearly all commercially produced cotton is a cultivar of American Upland. Upland cotton seed is widely known as Mexican cotton for its ability to thrive in warm, arid, and full-sun climates with poor soils and is known to suffer from too much care. About 250 cotton seeds per Ounce.