Blue Cornflower is an herb. The Blue cornflower dried flowers are used to make medicine. A magnificent wild plant with a clear blue flower, cornflower naturally grows in acidic garden soil, grain fields and mountainous ranges in our areas. Its flowers, both delicate and airy, make the landscape feel pristine. Dried blue cornflowers have been used as an herbal remedy for centuries. The dried flowers of the cornflower plant have long been used in folk medicine. They were thought to cure coughs, colds, fever and ailments.