We have found 26 plants that meet your criteria.

Mexican giant hyssop
Agastache 'Blue Fortune' Mexican giant hyssop Spires of lilac flowers and aromatic leaves £6.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £4.99 Buy
catmint
Nepeta × faassenii catmint Loose drifts of lavender flowers. Great for edging £7.99 Buy
catnip
Nepeta racemosa 'Walker's Low' catnip Long flowering period £7.99 Buy
catmint
Nepeta 'Six Hills Giant' catmint A hardy catmint with lavender flowers £7.99 Buy
Russian sage
Perovskia atriplicifolia 'Little Spire' (PBR) Russian sage A shorter form of the popular Russian sage £9.99 Buy
Russian sage
Perovskia 'Blue Spire' Russian sage Violet-blue flowers and silvery foliage. Great planted en masse £9.99 Buy
New
Russian sage
Perovskia 'Blue Spire' Russian sage Violet-blue flowers and silvery foliage. Great planted en masse £5.99 Buy
New
border phlox
Phlox paniculata 'Blue Paradise' border phlox Fragrant and colourful in summer £5.99 Buy
border phlox
Phlox paniculata 'Blue Paradise' border phlox Fragrant violet flowers all summer £7.99 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £8.99 Buy
rosemary
Rosmarinus officinalis Prostratus Group rosemary Forms a mat of fragrant foliage £9.99 Buy
Crocus Special Offers
sage (syn. Salvia May Night)
Salvia × sylvestris 'Mainacht' sage (syn. Salvia May... Large indigo-blue flowers NOW £5.99 Buy
purple sage
Salvia officinalis 'Purpurascens' purple sage Attractive red-purple young leaves £6.99 Buy
bog sage
Salvia uliginosa bog sage Intense blue flowers £7.99 Buy
Price Pruned
common Lilac
Syringa vulgaris 'Katherine Havemeyer' common Lilac Wonderful scented lavender-purple flowers NOW £16.99 Buy
sweet violet
Viola odorata sweet violet Sweetly fragrant flowers £6.99 Buy
sweet violet
Viola odorata sweet violet Sweetly scented, edible flowers £2.49 Buy
New
violet
Viola odorata 'Hungarian Beauty' violet A pale-flowered version of the classic violet £5.99 Buy