'Hidcote' English Lavender-One of the most popular lavenders around, 'Hidcote' supplies silvery foliage and dark purple-blue flowers from late spring to early summer.
Good edging plant in semi shade.
bergamotplant (Monarda 'Snow Queen')
Eryngium (or sea holly) makes a real statement in your garden - stunning blue stems and flower heads. It's lovely as a cut flower too.