Carpets of fragrant violet blue flowers in spring.

Phlox paniculata 'Blue Paradise' is mildew-resistant with a spicy vanilla-clove fragrance and lavender-blue flowers.

Phlox 'Rocky Road Periwinkle' is a creeping hybrid spring phlox with flowers of blue to light purple tones.

Polemonium pulcherrimum 'Golden Feathers' is a Jacob's ladder with variegated green and yellow foliage and mauve flowers.

Polemonium 'Hurricane Ridge' has clusters of lilac-blue flowers atop dense, mounded, fern-like foliage.

Primula auricula Bavarian Gaudi 'Fanny' is an auricula primrose with single flowers of light blue and violet-blue with yellow centres.

Primula Belarina 'Amethyst Ice' has enormous heads of fragrant spring double flowers in rich blue violet.

Primula Belarina 'Baltic Blue' offers fully double, ruffled, soft to mid blue flowers with darker striping.

Primula Belarina 'Cobalt Blue' has enormous heads of fragrant spring double flowers in amazing true royal blue.

Primula Prima Belarina 'Blue Champion' has gorgeous, extra large, royal blue flowers.

Pulmonaria 'Moonshine' has silver-white leaves edged in dark green with small, pale, blue-white flowers .

Pulmonaria 'Trevi Fountain' has silver-spotted foliage with profuse clusters of large cobalt-blue flowers.

The striped squill, Puschkinia libanotica, is a lovely naturalizer for sun to part shade with pale blue to white flowers with a royal blue stripe down the middle of each petal.