We have found 15 plants that meet your criteria.

Price Pruned
Lavandula angustifolia 'Munstead' Lavender A compact variety with blue-purple flowers NOW £4.99 Buy
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Lavandula x intermedia 'Grosso' Lavender A vigorous variety with violet flowers NOW £4.99 Buy
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Lavandula 'Willow Vale' Lavender Makes a stunning, informal flowering hedge NOW £4.99 Buy
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Lavandula 'x chaytoriae Silver Sands' Lavender Stunning, silver foliage and dark purple flowers NOW £4.99 Buy
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Rosa Rhapsody in Blue '('Frantasia') (PBR)' rose (shrub) The closest to a blue rose NOW £10.99 Buy
Hebe 'Red Edge' Shrubby Veronica Small hebe with lilac flowers £7.99 Buy
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Lavandula angustifolia 'Hidcote' Lavender A compact lavender, with intense, violet flowers NOW £4.99 Buy
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Lavandula pedunculata subsp. 'pedunculata' French Lavender (syn L. stoechas... Distinctive butterfly-like, mauve flowers NOW £4.99 Buy
Lavandula 'Rocky Road' French Lavender A new variety with pale pink, butterfly like flowers £6.99 Buy
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Paeonia 'Deep Purple' Tree Peony / Tree Paeony... Tree peony with huge, purple flowers NOW £9.99 Buy
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Paeonia 'Lavender' Tree Peony / Tree Paeony... Huge, frilly, lavender-pink flowers NOW £9.99 Buy
Pittosporum tenuifolium 'Tom Thumb' Kohuhu Small, rounded shrub with purple leaves. £8.99 Buy
Rhododendron 'Anah Kruschke' Hybrid Rhododendron Eye-catching purple blooms £19.99 Buy
Price Pruned
Rosa 'Cardinal de Richelieu' rose Cardinal de Richelieu (gallica)... Velvety purple blooms NOW £10.99 Buy
Vinca minor 'Atropurpurea' Lesser Periwinkle Delicious dark damson-purple flowers £5.99 Buy