We have found 68 plants that meet your criteria.

Hyssop ‘Agastache Black Adder’ Distinctive violet, bottlebrush flowers £5.45 Buy
Angelica ‘Angelica gigas’ Tall, dramatic burgundy flowers £6.95 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris var. stellata Black Barlow’ Striking dark purple, double flowers NOW £4.95 Buy
New England Aster ‘Aster novae-angliae Violetta’ Beautiful deep purple flowers £5.95 Buy
Michaelmas Daisy ‘Aster novi-belgii Purple Dome’ Masses of violet-purple flowers in late summer £5.95 Buy
Masterwort ‘Astrantia major Rubra’ Gorgeous plum-coloured flowers £5.95 Buy
Price Pruned
Foxglove ‘Digitalis purpurea Excelsior Group’ Perfect for a cottage-style garden NOW £5.45 Buy
Price Pruned
Foxglove ‘Digitalis x mertonensis’ Towering spikes of carmine flowers NOW £5.45 Buy
Price Pruned
Dusky Cranesbill ‘Geranium phaeum var. phaeum Samobor’ Small, purple-black flowers. Good for damp or dry shade NOW £5.45 Buy
Cranesbill ‘Geranium pratense Midnight Reiter’ Unusual deep purple foliage £5.95 Buy
Armenian Cranesbill ‘Geranium psilostemon’ Gorgeous magenta flowers with black centres £5.95 Buy
Geranium ‘Geranium sylvaticum Birch Lilac’ Great for a woodland setting £5.95 Buy
Stinking Hellebore ‘Helleborus foetidus Wester Flisk group’ Sweetly scented, bell-shaped blooms £5.95 Buy
Plaintain Lily ‘Hosta Sum and Substance’ Slugs and snails hate this one ! £5.95 Buy
Price Pruned
Gay Feather ‘Liatris spicata Kobold’ Magenta, bottlebrush-like flowers NOW £5.45 Buy
Big Blue Lily-turf ‘Liriope muscari’ Purple, wand-like flowers and evergreen foliage £6.95 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.45 Buy
Catmint ‘Nepeta x faassenii Kit Cat’ A dwarf variety with purple flowers £5.95 Buy
Oriental Poppy ‘Papaver orientale Manhattan’ Beaufitul lavender-rose flowers £5.95 Buy
Jerusalem Sage ‘Phlomis tuberosa Amazone’ Whorls of lilac flowers and architectural seedheads £6.95 Buy