The cornflower is considered a beneficial weed, and its edible flower can be used for culinary decoration, for example to add colour to salads. Cornflowers have been used and prized historically for their blue pigment.Cornflowers are often used as an ingredient in some tea blends and herbal teas, and is famous in the Lady Grey blend of Twinings.
Light requirements: full sun. Water requirements: high-average water daily. Soil pH requirements: neutral (6.6-7.5) to mildly alkaline (7.6-7.8).
Cornflower blue is a shade of medium-to-light blue containing relatively little green compared to blue. This hue was one of the favorites of the Dutch painter Johannes Vermeer.
The most valuable blue sapphires are called cornflower blue, having a medium-dark violet-blue tone.