Spiraea cantoniensis ‘Flore Pleno’
This old fashioned semi-evergreen shrub has been grown in western gardens since 1824 and in Chinese gardens for aeons before that. Small pure white double flowers are produced in clusters on cascading, arching branches during late spring and early summer. Easily grown in a sunny spot if given a fortnightly soak during dry periods. It will grow 150-180cm tall by 180cm wide.