What does it mean if artichoke is purple?

Online Answer
The "vegetable" that we eat is actually the plant's flower bud. If allowed to flower, the blossoms measure up to seven inches in diameter and are a beautiful violet-blue color. There are more than 140 artichoke varieties but less than 40 are grown commercially..
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Purple is formed by mixing red and blue in a ratio close to 1:1, whereas violet is perceived by your eyes as containing more blue than red. ... You can have a source of monochromatic violet light (i.e. a source producing just a single wavelength), but everything that looks purple must emit both red and blue light..