We have found 28 plants that meet your criteria.

Japanese Anemone ‘Anemone x hybrida Honorine Jobert’ Lights up the garden in late summer £5.99 Buy
Aster ‘Aster lateriflorus Lady in Black’ Masses of tiny, pink-tinged daisies £5.99 Buy
Flat-topped Aster ‘Aster umbellatus’ Masses of small white flowers from late summer £5.99 Buy
Price Pruned
Bellflower ‘Campanula poscharskyana E H Frost’ Groundcover with white flowers NOW £4.99 Buy
Pink ‘Dianthus Mrs Sinkins’ Scented white flowers with ragged petals £5.49 Buy
Coneflower ‘Echinacea purpurea White Swan’ Glorious white flower heads £6.99 Buy
Mexican Fleabane ‘Erigeron karvinskianus’ Daisy like flowers turn from white to pink £5.99 Buy
Fleabane ‘Erigeron Sommerneuschnee’ Pretty white daisies with fine petals £5.99 Buy
White Snakeroot ‘Eupatorium rugosum Chocolate’ A late-flowering perennial with lovely, dark foliage £5.99 Buy
Gaura ‘Gaura lindheimeri’ White, star-shaped flowers and long season £5.49 Buy
Gaura ‘Gaura lindheimeri Whirling Butterflies’ Long-lasting, white flowers. Copes with drought £5.49 Buy
Bergamot ‘Monarda Schneewittchen (syn. Snow Maiden)’ Whorls of wonderful, white flowers £5.99 Buy
Price Pruned
Perennial Phlox (syn. Fujiyama)... ‘Phlox paniculata Mount Fuji’ Fragrant, small, starry white flowers NOW £5.49 Buy
Ice Plant ‘Sedum spectabile Stardust’ White flowers in the late summer early autumn £5.49 Buy
Lamb's Ears ‘Stachys byzantina Silver Carpet’ Non-flowering silver foliage £5.99 Buy
Sneezewort ‘Achillea ptarmica The Pearl’ Masses of snow-white, button flowers £5.99 Buy
Price Pruned
Sowbread ‘Cyclamen hederifolium f. albiflorum’ Pure white flowers and beautiful leaves NOW £3.99 Buy
Pink ‘Dianthus Cranmere Pool’ Large, pale pink, scented flowers £5.49 Buy
Rock Cranesbill ‘Geranium macrorrhizum Album’ White flowers. Perfect for suppressing weeds £5.99 Buy
Everlasting Sweet Pea ‘Lathyrus latifolius White Pearl’ Climber with white, sweet pea-like flowers £5.99 Buy