Aster 'Little Carlow' (Syn. Symphyotrichum 'Little Carlow' (cordifolium hybrid)): Large sprays of small purplish blue flowers in autumn. Very reliable, easy to grow perennial. Hardy. Up to 1m.

Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. An earlier flowering variety. Height to 1m.

Campanula persicifolia (Peach-leaved bellflower): Tall spikes of large, cup-shaped blue flowers over slender foliage in mid-summer. To 1.2m. Hardy

Poa labillardierei (Blue tussock grass): Elegant, upright grass with slender blue-green leaves. Arching, open biscuity-coloured panicles in mid-summer. Evergreen.To 1.2m Hardy [Collect Only]

Salvia guaranitica 'Blue Enigma' (Anise-scented sage 'Blue Enigma'): Tall spikes of deep blue, flowers. Frost-hardy. Up to 1.2m. Prefers full sun and a sheltered spot. Late summer. Attractive to bees.