Matthiola incana, known as hoary stock, is a species of flowering plant in the genus Matthiola. The common name stock usually refers to this species, though it may also be applied to the whole genus. The common name "night-scented stock" or "evening-scented stock" is applied to Matthiola longipetala (syn. bicornis). M. incana is also known in the USA by the common name tenweeks stock. It is a common garden flower, available in a variety of colours, many of which are heavily scented and also used in floristry.