Dierama 'Blackberry Bells' (Angel's Fishing Rod): Large bells of deep-purple maroon flowers held on tall, slender stems above grass-like foliage. Hardy. To 1.2m

Heuchera 'Midnight Rose': Darkest purple leaves, splashed with bright pink. Excellent for all year round foliage colour. Hardy. Up to 30cm.

Hosta 'Devon Green': Elegant hosta with tapering, dark green, fine-veined leaves. Lilac flowers in summer [Collect Only]

Primula vialii (Vial's Primrose): Flower spikes of crimson buds open into a mass of pale purple flowers in mid-summer. Often reflowers in late summer/autumn

Salvia 'Amistad' PBR (Sage 'Amistad'): Tender perennial deep purple tubular flowers with a dark black calyx. Flowering from early summer to first frosts. Deadhead to prolong flowering. Up to 1.2m. [Collect Only]

Salvia guaranitica 'Black and Blue' (Anise-scented sage 'Black and Blue'): A subshrubby perennial with mid-green leaves. Spikes of rich blue and purple-blue flowers from late summer to late autumn.

Salvia x jamensis 'Nachtvlinder' (Sage 'Nachtvlinder'): Regal purple flowers on upright stems throughout late summer into autumn.

Thalictrum 'Splendide' (Rue 'Splendide'): Superb Thalictrum with clouds of purple flowers open for a very long time in late summer. Hardy. Up to 1.5m

Thalictrum delavayi (Chinese meadow rue): Dainty lilac-mauve flowers 2cm in width, with prominent creamy yellow stamens above fern-like bright green leaves. Hardy. Up to 1.5m.

Thalictrum delavayi 'Hewitt's Double' (Chinese meadow rue 'Hewitt's Double'): Tiny purple pom-pom flowers dance airily above ferny grey-green foliage. Height to 1.2m. Hardy