We have found 11 plants that meet your criteria.

Actaea simplex 'Atropurpurea Group' Bugbane (syn. Cimicifuga) A late-flowering perennial for shade £8.99 Buy
Price Pruned
Actaea simplex 'Brunette' Bugbane (syn. Cimicifuga) Tall, dramatic flower spikes in early autumn NOW £12.99 Buy
Price Pruned
Anthriscus sylvestris 'Ravenswing' Cow Parsley Lacy purple foliage with a sprinkling of white flowers NOW £5.99 Buy
Aster lateriflorus 'Lady in Black' Aster Masses of tiny, pink-tinged daisies £5.99 Buy
Price Pruned
Hedychium greenii Ginger Lily A more compact form with red flowers NOW £6.99 Buy
Phormium 'Platt's Black' New Zealand Flax Dramatic, almost black, strappy foliage £13.99 Buy
Rodgersia pinnata 'Chocolate Wing' Rodgersia Rich chocolate brown leaves are produced in the spring. £5.99 Buy
Price Pruned
Berberis thunbergii 'Helmond Pillar' Barberry An upright shrub with purple leaves NOW £5.99 Buy
Price Pruned
Lobelia cardinalis 'Queen Victoria' Cardinal Flower Bright red flowers and maroon foliage NOW £5.99 Buy
Phormium 'Bronze Baby' New Zealand Flax Compact variety with purple-bronze leaves £13.99 Buy
Sambucus nigra 'Eva' Black Elder (syn. Black... A striking plant with dramatic almost black, dissected foliage £8.99 Buy