Achillea filipendulina 'Gold Plate' (Yarrow 'Gold Plate'): Statuesque achillea with huge, flat gold flower heads above upright ferny foliage. A statement plant for dry, sunny borders. Hardy. To 1m. [Collect Only]

Agastache 'Blackadder' (Giant hyssop 'Blackadder'): Bright blue flower spikes and aromatic foliage - very attractive to bees. To 1.2m. Hardy

Anemone x hybrida 'Honorine Jobert' (Japanese Anemone 'Honorine Jobert'): Large white flowers flowering from late summer to autumn. Good in almost any soil, except wet. Fully hardy. To 1.2m [Collect Only]

Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. An earlier flowering variety. Height to 1m.

Baptisia 'Indigo Spires' (Indigo weed 'Indigo Spires'): Spikes of violet-blue pea-like flowers with a yellow edge above a mound of grey-green foliage. Long flowering. Hardy. Up to 1.2m

Baptisia 'Purple Smoke' (Indigo weed 'Purple Smoke'): Tall spikes of violet pea-like flowers on almost black stems, attractive grey-green foliage. Dark-grey seed pods. Hardy. Up to 1.2m

Baptisia 'Solar Flare' (Indigo weed 'Solar Flare'): New Baptisia with unusual golden yellow pea-like flowers which deepen in colour as they age producing a multicoloured effect. Hardy. Up to 90cm.

Digitalis purpurea 'Sutton's Apricot' (Foxglove 'Sutton's Apricot'): Spires of soft apricot flowers in early to mid summer.

Dryopteris wallichiana (Alpine wood fern): A deciduous fern with hairy stems and green upright shuttlecock-like foliage. Shade-loving. Hardy. Up to 1m. [Collect Only]

Euphorbia characias subsp. wulfenii (Mediterranean spurge): Evergreen perennial with blue-green leaves and vibrant lime-green flowers in early summer. Prefers full sun. Hardy to about -10C, but not for long periods. Up to 1.2m.

Kniphofia 'Alcazar' (Red hot poker 'Alcazar'): Tall spikes of vibrant red-orange flowers opening to a paler yellow to give a two-tone effect. Strappy green foliage. Hardy. Up to 1.2m. [Collect Only]

Kniphofia 'Dorset Sentry' (Red hot poker 'Dorset Sentry'): Bold spikes of yellow flowers from green beds on sturdy bronze stems. To 1.2m Hardy. [Collect Only]

Kniphofia 'John Benary' (Red hot poker 'John Benary'): Bright coral-red flower spikes above strappy green foliage.

Kniphofia 'Timothy' (Red hot poker 'Timothy'): Tall spikes of creamy orange flowers on bronze stems in mid-late summer. Superb in sunny, dry borders. To 1.2m. Hardy [Collect Only]

Lychnis coronaria 'Alba' (Rose campion (white)): Pure white flowers on tall silver stems above rosettes of silver leaves

Lychnis coronaria Atrosanguinea Group (Rose campion (dark red)): Bright magenta flowers over felty, silver foliage. Great for sunny, dry areas can be short lived in a wet, cold winter. To 1.2m Hardy.

Perovskia 'Blue Spire' (Russian Sage 'Blue Spire'): Fine spikes of purple flowers on silver stems. Lovely winter stem effect. Hardy. Up to 1m.

Salvia 'Amethyst Lips' (PBR) (Sage 'Amethyst Lips): Bicolour flowers in white and deep purple and delicious scented foliage. Half-hardy, copes with -5C in a sheltered spot. To 1m.

Salvia 'Hot Lips' (Sage 'Hot Lips'): Bicolour flowers in white and lipstick red and delicious scented foliage. Half-hardy, copes with -5C in a sheltered spot. To 1m.