Half hardy annuals with blue flowers Seed companies have a habit of using the term 'blue' to describe a variety of lilac shades as well as true blues; most of these really are blue. Ageratum 'Blue Horizon' Fluffy heads; for border or cutting. 2ft/60cm Ageratum 'Blue Swords' Clear colour; strong, mounded plants. 9in/23cm Brachyscome 'Blue Star' Quilled petals, purple tinted; edging. 1ft/30cm Callistephus (Aster) 'Blue Bedder' Tight hummocks; late, double flowers. 1ft/30cm Campanula 'Krystal Blue' Blue bells; neat trailer; tiny seed. 9in/23cm Delphinium chinensis 'Sky Blue' Exquisite penetrating shade. 15in/6in Heliophila longifolia Clouds of small, white centred flowers. 18in/45cm Impatiens 'Super Elfin Blue Pearl' Blueish, the nearest so far. 6in/15cm Lobelia 'Cambridge Blue' Pale blue bushy lobelia; tiny seed. 6in/15cm Lobelia 'Crystal Palace' Deep blue set against bronze leaves. 6in/15cm Lobelia 'Sapphire' Dark blue with a white eye; trailing habit. Lobelia valida 'Blue Ribbons' White-eyed blue; upright habit. 1ft/30cm Petunia 'Blue Daddy' Good blue with attractive dark veining. 1ft/30cm Petunia 'Celebrity Sky Blue' The nearest to pale blue; lovely. 1ft/30cm Salvia farinacea 'Blue Victory' Slim silver stems; tight spikes. 18in/45cm Salvia patens 'Cambridge Blue' Huge flowers, but sparse. 18in/45cm Solanum sisymbrifolium Rare, very spiny, but striking; pale. 3ft/90cm Verbena 'Blue Lagoon' Good blue heads on spreading plants. 9in/23cm Viola (Pansy)'Blue Velour' Small flowered; bushy and very prolific. 6in/15cm Viola (Pansy) 'The Joker' Pretty faced blue and white with yellow eye. 6in/15cm   Back to Choosing Annuals. Hardy annuals - are for sowing in the garden Half hardy annuals - are for raising indoors or buying in   Adapted from The Planting Planner by Graham Rice   ©copyright 1999 Graham Rice. All Rights Reserved. All Images Digitally Watermarked.