We have found 89 plants that meet your criteria.

Catnip ‘Nepeta racemosa Walker's Low’ Long flowering period £5.99 Buy
Catmint ‘Nepeta subsessilis Cool Cat’ Lavender-blue flowers. Great for a herb garden £5.99 Buy
Catmint ‘Nepeta subsessilis Washfield’ Pretty catmint with bright blue flowers £5.99 Buy
Catmint ‘Nepeta x faassenii’ Loose drifts of lavender flowers. Great for edging £5.99 Buy
Catmint ‘Nepeta x faassenii Kit Cat’ A dwarf variety with purple flowers £5.99 Buy
Beards Tongue ‘Penstemon Jean Grace’ Stunning mediterranean blue flowers £5.99 Buy
Russian Sage ‘Perovskia Blue Spire’ Violet-blue flowers and silvery foliage. Great planted en masse £7.99 Buy
Price Pruned
Perennial Phlox ‘Phlox paniculata Blue Paradise’ Fragrant violet flowers all summer NOW £5.49 Buy
Jacob's Ladder ‘Polemonium Lambrook Mauve’ Large, bell-shaped, mauve flowers in early summer. £5.99 Buy
New
Spanish Sage ‘Salvia lavandulifolia’ A great alternative to common sage £4.99 Buy
Sage ‘Salvia patens’ Large, stunning blue blooms £5.99 Buy
Bog Sage ‘Salvia uliginosa’ Intense blue flowers £5.99 Buy
Salvia May Night ‘Salvia x sylvestris Mainacht’ Large indigo-blue flowers £5.99 Buy
Price Pruned
Pincushion Flower ‘Scabiosa Butterfly Blue’ Delightful pale blue pincushion flowers NOW £5.49 Buy
Pincushion Flower ‘Scabiosa columbaria nana’ A compact form with more flowers £5.49 Buy
Summer Glory Collection ‘Summer Glory Collection’ Create an explosion of colour and life in your garden. £2.99 Buy
Speedwell ‘Veronica austriaca teucrium Crater Lake Blue’ Ultra-marine flowers £5.99 Buy
Speedwell ‘Veronica Shirley Blue’ Saucer-shaped blue flowers £5.49 Buy
African Lily ‘Agapanthus Black Pantha’ Deep blue, almost black flowers £8.99 Buy
African Lily ‘Agapanthus Headbourne Hybrids’ Showy globes of blue and white flowers £5.99 Buy