We have found 124 plants that meet your criteria.

Hyssop ‘Agastache Black Adder’ Distinctive violet, bottlebrush flowers £5.99 Buy
Allium Purple Sensation ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £3.50 Buy
Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Allium cristophii ‘Allium cristophii’ Huge globes of star-like, lilac flowers £5.00 Buy
Allium Globemaster ‘Allium Globemaster’ Enormous, deep violet globes £5.00 Buy
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Allium Schubertii ‘Allium schubertii’ The flowers look like giant fireworks £7.50 Buy
Round-headed Leek ‘Allium Sphaerocephalon’ Small, wine-coloured flowers on tall stems £4.00 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris var. stellata Black Barlow’ Striking dark purple, double flowers NOW £4.99 Buy
Tufted Hair-grass ‘Deschampsia cespitosa’ Ideal for sun or shade £5.99 Buy
Price Pruned
Foxglove ‘Digitalis purpurea Excelsior Group’ Perfect for a cottage-style garden NOW £5.49 Buy
Price Pruned
Foxglove ‘Digitalis x mertonensis’ Towering spikes of carmine flowers NOW £5.49 Buy
Dusky Cranesbill ‘Geranium phaeum’ Small, deep maroon flowers. Good for groundcover £5.99 Buy
Price Pruned
Dusky Cranesbill ‘Geranium phaeum var. phaeum Samobor’ Small, purple-black flowers. Good for damp or dry shade NOW £5.49 Buy
Cranesbill ‘Geranium pratense Midnight Reiter’ Unusual deep purple foliage £5.99 Buy
Geranium ‘Geranium sylvaticum Birch Lilac’ Great for a woodland setting £5.99 Buy
Price Pruned
Big Blue Lily-turf ‘Liriope muscari’ Purple, wand-like flowers and evergreen foliage NOW £5.99 Buy
Price Pruned
Purple Moor Grass ‘Molinia caerulea subsp. arundinacea Transparent’ Tall and see-through NOW £5.99 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.49 Buy
Catnip ‘Nepeta racemosa Walker's Low’ Long flowering period £5.99 Buy