Hepatica noblis is a charming woodlander with exquisite violet blue blooms and petite green foliage.

Hepatica transsilvanica 'Blue Jewel' is a vigorous, easy-to-grow treasure with royal blue flowers over mounds of tri-lobed foliage.

Hibiscus 'Blue Bird' is a rose of Sharon with single, vase-shaped, violet-blue flowers and dark reddish-purple centres.

Hibiscus Summer Spice 'Bleu Brulee' has incredible sky blue flowers around a red centre.

A real collector's item, 'Mini Skirt' is a mini Hosta that forms a fabulous, ruffled mound of variegated leaves.

ZAP! Hosta 'Electrocution' has twisted and rippled variegated leaves that will electrify your garden with form and texture.

Hyacinthoides non-scripta 'Bakkum Blue' is a vivid royal blue and purple form of the fabled English bluebell.

Hyacinthus 'Rembrandt' has spikes of fragrant, true blue flowers with white edges outlining each flower.

'Ayesha' is the "popcorn Hydrangea" with unusual petals that are cupped outwards in shades of pink through lavender to blue.

Hydrangea macrophylla BloomChampion Mysterious Blue has stunning multicoloured double florets on compact plants.

Hydrangea Blue Enchantress is a rebloomer with black stems and mopheads of glowing blue or pink flowers.

Hydrangea macrophylla 'Blue Wave' is a classic lacecap cultivar with blue or pink flowers depending on soil pH.

Cityline Mars is a dramatic Hydrangea with white edged florets that can range from glowing royal blue to deep pink.

Cityline Rio is a gorgeous Hydrangea macrophylla with bold colours of deep blue in acidic soil and deep purple in alkaline soil.

Cityline Venice is a gorgeous Hydrangea with bold colours of deep blue in acidic soil and deep pink in alkaline soil.

Cityline Vienna is a gorgeous Hydrangea with bold colours of royal blue in acidic soil and glowing pink in alkaline soil.

Hydrangea macrophylla 'Double Down' is a unique, double flowered, mophead with blue or pink flowers.

Hydrangea macrophylla 'Double Down' is a unique, double flowered, mophead with blue or pink flowers.

Hydrangea macrophylla 'Elizabeth Ashley' is a bigleaf hydrangea with large, mophead flowers of sky blue or vivid pink.

Endless Summer Pop Star is a reblooming, compact lacecap Hydrangea with beautiful blue flowers, bluish-purple, or pink flowers.