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Centaurea cyanus
It is an annual plant growing to 16-35 inches tall, with grey-green branched stems. The leaves are lanceolate, 1–4 cm long. The flowers are most commonly an intense blue colour, produced in flowerheads (capitula) 1.5–3 cm diameter, with a ring of a few large, spreading ray florets surrounding a central cluster of disc florets. The blue pigment is protocyanin, which in roses is red. In the past it often grew as a weed in crop fields, hence its name (fields growing grains such as wheat, barley, rye, or oats are sometimes known as corn fields in the UK.
Native to Europe. It is also, however, through introduction as an ornamental plant in gardens and a seed contaminant in crop seeds, now naturalised in many other parts of the world, including North America and parts of Australia. This one was growing near a large field along a dirt road in Aiken County, SC.
It's also known as Bachelors button, Bluebottle, Boutonniere flower, Hurtsickle, and Cyani flower. Cornflowers are often used as an ingredient in some tea blends and tisanes
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