Large white or bluish-white double or semi-double flowers in June. Single flowers on new growth later. Anthers white with brown or red-violet connectives.The flowers are bluer than those of 'Jackmanii Alba' and the leaves are golden yellow; sometimes leaflets have a red margin.
Caddick's nursery in the UK also named a cultivar 'Celebration'. When this (Godfrey's) form was given European PBR in 2001, the Caddick's form was renamed 'Pink Celebration'.