Wild or cultivar?
No interactions present.
There are two well know n cultivars.
L.diffusa 'Heavenly Blue' and L.diffusa 'Grace Ward'. Also a white cultivar.
David J Trevan
Better known to gardeners as Lithospermum diffusum!
Great extra information - this plant is brightens up even a gloomy damp and wet jubilee holiday!
Lat/Lng: 53.0, -1.5
OS grid ref: SK3648