We have found 17 plants that meet your criteria.

butterfly bush
Buddleja 'Lochinch' butterfly bush Fragrant violet-blue flowers all summer £8.99 Buy
Siberian iris
Iris sibirica 'Perry's Blue' Siberian iris Looks great planted in bold clumps £8.49 Buy
New
tall bearded iris
Iris 'Best Bet' tall bearded iris Tall and elegant £9.99 Buy
bearded iris
Iris 'Dusky Challenger' bearded iris Huge ruffled silky rich purple-blue blooms £8.49 Buy
bearded iris
Iris 'Jane Phillips' bearded iris A popular variety with blue flowers £7.99 Buy
tall bearded iris
Iris 'White City' tall bearded iris Magnificent in contemporary and cottage settings £7.99 Buy
perennial phlox
Phlox divaricata 'Blue Perfume' perennial phlox Masses of lilac-blue fragrant blooms £7.99 Buy
border phlox
Phlox paniculata 'Blue Paradise' border phlox Fragrant violet flowers all summer £7.99 Buy
Price Pruned
rose Rhapsody in Blue (shrub)
Rosa Rhapsody in Blue ('Frantasia') (PBR) rose Rhapsody in Blue (shrub)... The closest to a... NOW £13.49 Buy
Price Pruned
common Lilac
Syringa vulgaris 'Katherine Havemeyer' common Lilac Wonderful scented lavender-purple flowers NOW £14.99 Buy
sweet violet
Viola odorata sweet violet Sweetly scented, edible flowers £2.49 Buy
clematis (group 3)
Clematis 'Betty Corning' clematis (group 3) Pale lilac nodding bells with a delicate fragrance £9.99 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £7.99 Buy
rosemary
Rosmarinus officinalis Prostratus Group rosemary Forms a mat of fragrant foliage £9.99 Buy
New
violet
Viola odorata 'Hungarian Beauty' violet A pale-flowered version of the classic violet £5.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 coming soon
sweet violet
Viola odorata sweet violet Sweetly fragrant flowers £6.99 coming soon