Agapanthus Africanus is an evergreen perennial which grows in small clumps. It's foliage is mid green and leaves are pointed and glossy. These make a beautiful backdrop for the tall stems that grow in summer, producing huge balls of deep blue, trumpet shaped flowers. 

At a glance:

Evergreen foliage

Deep blue flowers appear in summer

Full sun

Well drained fertile soil

Hardy

Will reach a height of 0.6m and a spread of 0.9m over 2-5 years