We have found 19 plants that meet your criteria.

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Acer platanoides 'Crimson Sentry' Norway Maple Interesting tree due to its habit NOW £32.99 Buy
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Ajuga reptans 'Atropurpurea' Bugle Good groundcover for shade NOW £4.99 Buy
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Ajuga reptans 'Catlin's Giant' Bugle Handsome evergreen ground cover NOW £4.99 Buy
Euphorbia amygdaloides 'Purpurea' Wood Spurge Lovely deep purple foliage and acid-yellow flowers £5.49 Buy
Euphorbia 'Blackbird' Wood Spurge A fairly recent introduction £7.99 Buy
Geranium pratense 'Midnight Reiter' Cranesbill Unusual deep purple foliage £5.99 Buy
Phormium 'Platt's Black' New Zealand Flax Dramatic, almost black, strappy foliage £13.99 Buy
Sambucus nigra 'Gerda' Black Elder (syn. Black Beauty)... Dramatic purple foliage £8.99 Buy
Acer platanoides 'Crimson King' Norway Maple A large handsome tree with attractive foliage £37.99 Buy
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Berberis thunbergii f. 'Atropurpurea Nana' Barberry A shrub with yellow flowers in spring... NOW £5.99 Buy
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Berberis thunbergii 'Helmond Pillar' Barberry An upright shrub with purple leaves NOW £5.99 Buy
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Cotinus coggygria 'Royal Purple' Smoke Bush Magnificent smoke-like plumes NOW £8.99 Buy
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Cotinus 'Grace' Smoke Bush Fiery autumn colour NOW £9.49 Buy
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Euphorbia cyparissias 'Fens Ruby' Cypress Spurge Dusky purple leaves and bright yellow flowers in summer NOW £5.49 Buy
Phormium 'Bronze Baby' New Zealand Flax Compact variety with purple-bronze leaves £13.99 Buy
Pittosporum tenuifolium 'Tom Thumb' Kohuhu Small, rounded shrub with purple leaves. £8.99 Buy
Prunus cerasifera 'Nigra' Black-leaved Plum Purple leaves and white blossom in spring. £34.99 Buy
Sambucus nigra 'Eva' Black Elder (syn. Black... A striking plant with dramatic almost black, dissected foliage £8.99 Buy
Viola riviniana 'Purpurea Group' Wood Violet (syn. Viola labradonica... Ideal for a woodland garden £4.99 Buy