We have found 30 plants that meet your criteria.

yarrow
Achillea millefolium 'Lilac Beauty' yarrow An unusual lilac, yarrow £7.99 Buy
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African lily
Agapanthus 'Phantom' African lily A luscious evergreen form £8.99 Buy
dusky cranesbill
Geranium phaeum 'Lily Lovell' dusky cranesbill Iridescent saucers of purple flowers. Good for shade £7.99 Buy
veronica
Hebe 'Mrs Winder' veronica Purple foliage and bright blue flowers £9.99 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 'Sultan's Palace' bearded iris Sultry, maroon flowers NOW £6.99 Buy
Crocus Special Offers
bearded iris
Iris 'Superstition' bearded iris Purple-black flowers NOW £6.99 Buy
lavender
Lavandula × intermedia 'Grosso' lavender Considered by many to have the best scent £8.99 Buy
Crocus Special Offers
lavender promotion - 6 pack
Lavandula angustifolia lavender promotion - 6 pack... 6 Lavenders for less than £2.50 each NOW £14.99 Buy
Crocus Special Offers
lavender
Lavandula angustifolia 'Hidcote' lavender A compact lavender, with intense, violet flowers NOW £5.99 Buy
lavender
Lavandula angustifolia 'Imperial Gem' lavender An excellent variety for low hedges £8.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 Buy
French lavender (syn. Papillon)
Lavandula pedunculata subsp. pedunculata French lavender (syn. Papillon) Distinctive butterfly-like, mauve flowers £8.99 Buy
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French lavender
Lavandula 'Fathead' French lavender A hardy French lavender £8.99 Buy
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French lavender
Lavandula 'Helmsdale' (PBR) French lavender Burgundy-purple flowers topped by purple bracts £8.99 Buy
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French lavender
Lavandula 'Regal Splendour' (PBR) French lavender Incredible dark purple-violet flags £8.99 Buy
lavender
Lavandula 'Sawyers' lavender Compact mounds of silvery foliage £8.99 Buy
Jerusalem sage
Phlomis tuberosa 'Amazone' Jerusalem sage Whorls of lilac flowers and architectural seedheads £8.99 Buy
Crocus Special Offers
rosemary promotion - 6 pack
Rosmarinus officinalis rosemary promotion - 6 pack... 6 rosemaries for less than £2.50 each NOW £14.99 Buy
lamb's ears
Stachys byzantina 'Big Ears' lamb's ears Purple flowers large Grey-green leaves £7.99 Buy