Spreading mats of variegated foliage with spires of pale blue flowers.

Veronica liwanensis has tiny, glossy, oval leaves that form a neat evergreen mat and cobalt blue flowers with a white central eye.

Veronica 'Goldwell' produces darling blue flowers with white eyes and lush groundcovering foliage.

Veronica 'Blue Skywalker' is a long blooming spike speedwell with a narrow form and tall flower spikes of lavender-blue.

Veronica 'Reavis' Crystal River has abundant blue flowers with white centres in spring with scattered rebloom.

Veronicastrum virginicum 'Cupid' is a Culver's root with architectural lilac-blue blooms on tall rigid stems.

Veronica 'Tidal Pool' has darling blue flowers with white eyes and lush ground covering foliage.

Veronica 'Waterperry Blue' is a great evergreen speedwell with burgundy-flushed green foliage and charming lavender flowers.

Viola corsica, the Corsican violet, offers masses of violet-blue flowers with purple whiskers and tiny yellow centres.

Viola pedata is a lovely little violet with very cool, dissected foliage that looks like a bird's foot.

Viola Magnifi Scent 'Blue Sails' is a hardy viola with beautiful blue and white flowers and a strong, sweet violet fragrance.