We have found 71 plants that meet your criteria.

Beard Tongue (syn. Vesuvius) ‘Penstemon Yasius’ Large, deep purple, foxglove-like flowers £5.49 coming soon
Lungwort ‘Pulmonaria saccharata Mrs Moon’ Blue-lilac flowers green leaves with white spots £5.99 coming soon
Toad Lily ‘Tricyrtis formosana Dark Beauty’ Great for adding an exotic look £6.99 coming soon
Arum Lily (syn. Black Star)... ‘Zantedeschia Edge of Night’ Stunning black flowers £7.99 coming soon
Monkshood ‘Aconitum Sparks Variety’ Deep violet hooded flowers on tall stems £6.99 coming soon
Sweet Rocket ‘Hesperis matronalis’ Lilac flowers. Perfect for a wildlife garden £5.49 coming soon
West Country Lupin ‘Lupinus Masterpiece’ A new purple variety £6.99 coming soon
Price Pruned
Phlox ‘Phlox divaricata subsp. laphamii Chattahoochee’ Masses of lilac flowers. Perfect in partial shade NOW £5.49 coming soon
Salvia ‘Salvia x sylvestris Viola Klose’ Intense spires of dark violet flowers £5.99 coming soon
Price Pruned
Meadow Rue ‘Thalictrum aquilegiifolium’ Plumes of pale mauve flowers NOW £5.49 coming soon
Price Pruned
Culver's Root ‘Veronicastrum virginicum Temptation’ Striking rose-purple spikes NOW £5.49 coming soon