Agastache 'Blue Boa' (PBR) (giant hyssop 'Blue Boa'): Excellent new form of Agastache with much fatter spikes of vibrant purple-blue flowers, with aromatic foliage. Hardy. Up to 80cm.

Euphorbia characias 'Black Pearl' (Spurge 'Black Pearl'): Bold stems carrying green flowers with a distinctive black 'eye' in early summer. To 80cm. [Collect Only]

Filipendula 'Red Umbrellas' (Meadowsweet 'Red Umbrellas'): Green leaves, deeply veined with crimson, with clouds of fluffy pink flowers. Compact variety. Prefers a moist soil. Hardy. Up to 70cm. [Collect Only]

Geranium sylvaticum 'Album' (Wood cranesbill): Upright stems of white saucer-shaped flowers above deeply divided leaves. Prefers moist shadier spots. Hardy. Up to 70cm.

Geranium sylvaticum 'Mayflower' (Wood cranesbill 'Mayflower'): Tall variety of geranium with erect stems of violet-purple flowers with a white centre, above deeply divided leaves. Hardy. Up to 75cm. [Collect Only]

Geranium x magnificum (Purple cranesbill): Covered in a mass of rich, violet-blue flowers in early summer. Large, slightly felty leaves. Vigorous but a short flowering season. Up to 70cm.

Geum 'Mrs Bradshaw' (Avens 'Mrs Bradshaw'): Large double crimson-orange flowers in early-summer - a very eye-catching plant. Height to 70cm. Hardy

Hemerocallis 'Night Embers' (Day Lily 'Night Embers'): Large double red flowers with ruffled petals and a white edging, grass-like, strappy green foliage. Hardy. Up to 75cm. [Collect Only]

Iris 'Langport Wren': Sword-shaped glaucous green leaves and stems of up to 4 flowers, with rich reddish-purple and deep maroon almost brown flowers. [Collect Only]

Lythrum virgatum 'The Rocket' (Wand loosestrife 'The Rocket'): Slender upright spires of deep pink flowers from early to late summer. Likes moist conditions. Hardy. Up to 90cm.

Melica altissima 'Atropurpurea': Deciduous grass with green strappy leaves and large feathery purple flowers. Good for drying and as a cut flower. Hardy. Up to 80cm.

Papaver orientale 'Patty's Plum' (Oriental poppy 'Patty's Plum'): Huge sultry, antique bronzey purple flowers held above green hairy leaves

Thermopsis rhombifolia var. montana: Lupin-like with sunny yellow pea-like flowers and bright green foliage. Flowers followed by velvety-brown seed pods. Hardy. Up to 90cm.