We have found 22 plants that meet your criteria.

African lily
Agapanthus 'Black Pantha' (PBR) African lily Deep blue, almost black flowers £12.99 Buy
Crocus Special Offers
hollyhock (Althea)
Alcea rosea 'Nigra' hollyhock (Althea) Bees love their flowers NOW £4.99 Buy
hollyhock
Alcea rosea 'Nigra' hollyhock Tall stems bearing near-black flowers £1.49 Buy
New
granny's bonnet
Aquilegia vulgaris var. stellata 'Black Barlow' granny's bonnet Sumptuous dark purple, double... £4.99 Buy
granny's bonnet
Aquilegia vulgaris var.stellata 'Black Barlow' (Barlow Series) granny's bonnet Striking dark purple, double... £7.49 Buy
New
granny's bonnet
Aquilegia vulgaris var. stellata 'Nora Barlow' (Barlow Series) granny's bonnet Fabulous pom-pom flowers £7.49 Buy
Crocus Special Offers
Aquilegia Nora Barlow
Aquilegia vulgaris var. stellata 'Nora Barlow' (Barlow Series) Aquilegia Nora Barlow Unusually colourful flowers NOW £4.99 Buy
granny's bonnet
Aquilegia vulgaris 'William Guinness' granny's bonnet Unusual purple-black flowers £7.49 Buy
dusky cranesbill
Geranium phaeum dusky cranesbill Small, deep maroon flowers. Good for groundcover £7.99 Buy
dusky cranesbill
Geranium phaeum var. phaeum 'Samobor' dusky cranesbill Small, purple-black flowers. Good for shade £7.99 Buy
Price Pruned
Lenten Rose hellebore
Helleborus × hybridus Harvington double purple Lenten Rose hellebore Stunning double flowers NOW £11.99 Buy
Price Pruned
Lenten Rose hellebore
Helleborus × hybridus Harvington Smokey Blues Lenten Rose hellebore Unusual, dark purple flowers... NOW £12.99 Buy
daylily
Hemerocallis 'American Revolution' daylily Large, deep blood-red flowers in summer £8.99 Buy
Siberian iris
Iris chrysographes black-flowered Siberian iris Stunning, almost black flowers. For a damp spot £8.99 Buy
Crocus Special Offers
bearded iris
Iris 'Superstition' bearded iris Purple-black flowers NOW £6.99 Buy
moor grass
Sesleria autumnalis moor grass Perfect for informal edging £7.99 Buy
Price Pruned
Lenten Rose hellebore
Helleborus × hybridus 'Harvington Shades of the Night' Lenten Rose hellebore Early spring flowers in... NOW £9.99 Buy
New
dusky cranesbill
Geranium phaeum var. phaeum 'Samobor' dusky cranesbill Small, purple-black flowers. Good for damp... £4.99 coming soon
Price Pruned
Lenten Rose hellebore
Helleborus × hybridus 'Harvington Double Lime' Lenten Rose hellebore A gorgeous, new variety NOW £11.99 coming soon
beard tongue
Penstemon 'Raven' beard tongue Dramatic, deep purple, foxglove-like flowers £7.99 coming soon