austriaca 'Crater Lake Blue' Neat mounding plant with spikes of vivid blue flowers. 30cm (1ft). May-June.  £4.50 BUY NOW

'Ellen Mae' Introduced by us a few years ago, this has pretty spikes of lilac-pink flowers. These cover a round mound of small, mid-green leaves. Perfect for the front of a border or a small corner. 30cm (1ft). May-June. £5.00 BUY NOW

gentianoides Sky blue flowers carried above a thick carpet of shiny, deep green leaves. 45cm (18in). May-June. AGM. £4.50 BUY NOW

gentianoides 'Barbara Sherwood' Large pale blue flowers. 60cm (2ft). May-June. £4.50 BUY NOW

gentianoides 'Robusta' Same sky blue flowers, but larger with bigger leaves. Slightly later to bloom. 45cm (18in). May-June. £4.50 BUY NOW

gentianoides 'Tissington White' Pale blue flowers. 45cm (18in). May-June. £4.50 BUY NOW

longifolia 'Lilac Fantasy' Pretty spikes of lilac-blue flowers are carried on upright stems with fresh green, long leaves to form a neat clump. 60cm (2ft). June-July. £5.00 Sold Out

spicata Slender spikes of bright blue flowers rise from a tidy clump of truly green leaves. 60cm (2ft). Summer. £4.50 BUY NOW