We have found 28 plants that meet your criteria.

Mexican giant hyssop
Agastache 'Blue Fortune' Mexican giant hyssop Spires of lilac flowers and aromatic leaves £6.99 Buy
bluebeard
Caryopteris × clandonensis 'Heavenly Blue' bluebeard Piercing, dark blue flowers £8.99 Buy
New
geranium
Geranium wallichianum 'Havana Blues' geranium Good contrast between flowers and foliage £6.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £4.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 Buy
catmint
Nepeta × faassenii catmint Loose drifts of lavender flowers. Great for edging £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
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
sage
Salvia guaranitica 'Black and Blue' sage Towering and impressive £9.99 Buy
common sage
Salvia officinalis common sage A good companion plant £6.99 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
New
lavender
Lavandula angustifolia Melissa Lilac ('Dow4') (PBR) lavender Large, lilac flowers in... £4.99 Buy
New
Purple Sage
Salvia officinalis 'Purpurascens' Purple Sage Attractive red-purple young leaves £4.99 Buy
wildflower plug plant collection
Wildflowers for a boggy meadow wildflower plug plant collection A collection of 104... £89.99 Buy