We have found 33 plants that meet your criteria.

Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris var. stellata Black Barlow’ Striking dark purple, double flowers NOW £4.99 Buy
Price Pruned
Dusky Cranesbill ‘Geranium phaeum var. phaeum Samobor’ Small, purple-black flowers. Good for damp or dry shade NOW £5.49 Buy
Crocus Special Offers
Day Lily ‘Hemerocallis American Revolution’ Large, deep blood-red flowers in summer NOW £3.99 Buy
Siberian Iris ‘Iris chrysographes black-flowered’ Stunning, almost black flowers. For a damp spot £6.99 Buy
Intermediate Bearded Iris ‘Iris Langport Flame’ Sumptuous purple and orange fragrant flowers £6.99 Buy
Tree Peony / Tree Paeony... ‘Paeonia delavayi’ Tree peony with deep, maroon flowers £16.99 Buy
Black-eyed Susan ‘Rudbeckia occidentalis Green Wizard’ Bright green sepals with black centres £5.99 Buy
Black Elder (syn. Black Beauty)... ‘Sambucus nigra Gerda’ Dramatic purple foliage £8.99 Buy
Trillium ‘Trillium cuneatum’ Big maroon petals £3.00 Buy
Trillium ‘Trillium recurvatum’ Great for naturalising in woodland £3.00 Buy
Double Late Tulip ‘Tulipa Black Hero’ Almost black double flowers £5.00 Buy
Single Late Tulip ‘Tulipa Queen of Night’ Velvety, dark maroon blooms £3.00 Buy
African Lily ‘Agapanthus Black Pantha’ Deep blue, almost black flowers £8.99 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris William Guinness’ Unusual purple-black flowers NOW £4.99 Buy
Price Pruned
Clematis (Group 3) ‘Clematis Warsaw Nike’ Sumptuous deep purple flowers, NOW £7.99 Buy
Dusky Cranesbill ‘Geranium phaeum’ Small, deep maroon flowers. Good for groundcover £5.99 Buy
Siberian Iris ‘Iris chrysographes’ Deep purple flowers. Gorgeous beside water £6.99 Buy
Intermediate Bearded Iris ‘Iris Langport Wren’ Dark magenta flowers. Very free flowering £6.99 Buy
Price Pruned
Bearded Iris ‘Iris Superstition’ Purple-black flowers NOW £5.99 Buy
Price Pruned
Beard Tongue ‘Penstemon Raven’ Dramatic, deep purple, foxglove-like flowers NOW £5.49 Buy