Silene dioca alba (white campion)
A beautiful, softly hairy perennial, and one that brings fond memories of wild cottage gardens for me. Tall, strong but willowy stems carry quite large masses of pure white flowers around an inch across which have a lovely scent in the evenings. Height at flowering 60-80cm, enjoys full sun to part shade, growing happily here for me on the edge of my shade garden with just a half day of sun. 9cm pot.