We have found 87 plants that meet your criteria.

Price Pruned
Yarrow ‘Achillea millefolium Lilac Beauty’ An unusual lilac, yarrow NOW £5.49 Buy
Allium Purple Sensation ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £3.50 Buy
Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Allium cristophii ‘Allium cristophii’ Huge globes of star-like, lilac flowers £5.00 Buy
Allium Globemaster ‘Allium Globemaster’ Enormous, deep violet globes £5.00 Buy
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Round-headed Leek ‘Allium Sphaerocephalon’ Small, wine-coloured flowers on tall stems £4.00 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris var. stellata Black Barlow’ Striking dark purple, double flowers NOW £4.99 Buy
Michaelmas Daisy ‘Aster turbinellus’ Sprays of violet blue flowers £5.99 Buy
Camassia ‘Camassia leichtlinii’ Spires of blue or lilac star-shaped flowers £6.50 Buy
Geranium ‘Geranium sylvaticum Birch Lilac’ Great for a woodland setting £5.99 Buy
Plaintain Lily ‘Hosta Sum and Substance’ Slugs and snails hate this one ! £5.99 Buy
Intermediate Bearded Iris ‘Iris Langport Flame’ Sumptuous purple and orange fragrant flowers £6.99 Buy
Intermediate Bearded Iris ‘Iris Rare Edition’ Eyecatching variety with purple and white petals £6.99 Buy
Lily ‘Lilium nepalense’ Summer colour for a woodland garden £6.99 Buy
Price Pruned
West Country Lupin ‘Lupinus Manhattan Lights’ Bi-coloured blooms NOW £6.99 Buy
Price Pruned
Purple Moor Grass ‘Molinia caerulea subsp. arundinacea Transparent’ Tall and see-through NOW £5.99 Buy
Price Pruned
Purple Moor-Grass ‘Molinia caerulea subsp. caerulea Strahlenquelle’ One of the best ornamental grasses NOW £4.99 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.49 Buy
Phlox ‘Phlox paniculata Franz Schubert’ Wonderful, fragrant, lilac flowers £5.99 Buy