Cornflowers of the 'Blue Boy' variety belong to the family Asteraceae. It is a cultivar derived from Centaurea cyanus, an annual herbaceous plant native to Europe and North Asia that has long been considered an invasive weed in cereal crops and is one of the most beautiful wildflowers of our regions. It forms an upright clump with limp stems, reaching 80 cm high and 25 cm wide, bearing very narrow, long, greyish-green leaves. The flowering period lasts from June to August, displaying inflorescences in the form of double flower heads, 3 cm across.

The ligulate flowers (or the petals surrounding the centre) are toothed at their tips and are of a very bright medium-blue. The centre of the inflorescence is made up of purplish florets. The flowers are very melliferous and nectar-rich