This is a perennial Matthiola with grey, downy foliage and fragrant flowers, similar in shape with those of M. trojana, with narrow petals in various shades of purple to brown-yellow. Although a typical species for chalk associations, the few seedling grown proved to be easy to grow in a regular potting mix and later in the garden soil in a position with good drainage.
See images here: M. fragrans
I don’t think this species is in cultivation yet, so it will be interesting to see how it responds to being grown in various climates.
Germination: warm germinator (1-2 weeks at room temperature).