Agastache rugosa f.albiflora 'Liquorice White' (Korean mint 'Liquorice White'): Tall, aromatic perennial with spires of tiny white flowers. Aromatic foliage. To 1.5m. Fully hardy in light soils. May self-seed.

Cenolophium denudatum (Seseli libanotis, Baltic parsley): Flat umbels of pretty white flowers in summer. Fine, filigree foliage. Great in borders, sun or part shade. Hardy. To 90cm [Collect Only]

Centranthus ruber 'Albus' (White Valerian): White panicles of white flowers in mid-late summer. Very easy, self-seeds. Perennial and hardy. To 60cm.

Epilobium angustifolium 'Album' (White Rosebay Willowherb. Syn. Chamaerion angustifolium 'Album'): Slender spires of white flowers in late summer. Spreads rapidly through underground runners but doesn't self-seed.To 1.8m. Hardy. [Collect Only]

Gaura lindheimeri 'The Bride': Beautiful airy stems of white flowers in mid to late summer. Best in full sun, in well drained soil and a sheltered spot. Stems up to 1m. [Collect Only]

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

Penstemon 'White Bedder': Pure white tubular flowers over semi-evergreen foliage. Frost-hardy perennial. Up to 60cm.

Saxifraga x urbium (London Pride): Wiry stems topped with dainty pale pink flowers over ground evergreen rosettes of green leaves with creamy yellow markings.

Vinca minor f. alba 'Gertrude Jekyll' (Small white periwinkle 'Gertrude Jekyll'): A compact mat-forming evergreen perennial with trailing stems of dark green leaves. White flowers from mid spring to autumn.