Pentaglottis sempervirens, Green Alkanet, perennial wild flower.

Pentaglottis sempervirens (green alkanet, evergreen bugloss or alkanet) is a bristly, perennial plant native to Western Europe. It grows to approximately 60 cm (24") to 90 cm (36"), usually in damp or shaded places and often close to buildings. It has brilliant blue flowers, and retains its green leaves through the winter. The plant has difficulty growing in acidic soil (it is calcicolous). The name "alkanet" is also used for dyer's bugloss (Alkanna tinctoria) and common bugloss (Anchusa officinalis). Green alkanet blooms in spring and early summer. Its stamens are hidden inside narrow flower-tubes which end in a white eye in the centre of a blue flower.