Jasione

Jasione Jasione laevis 'Blue Light'
A perennial, reaching up to 1.5 x 1 foot, it can be an aggressive spreader. It is native to the British Isles and mainland Europe.
The narrowly-oblong, basal leaves are mid-green.
The blue flowers are borne during summer. Hardy zones 3b to 8 in full sun on light, well drained soil.