Brunfelsia latifolia, commonly known as Yesterday, today, tomorrow.
A Spring flowering evergreen shrub with flowers starting deep purple, then fade to lilac and white as they mature. When in flower, the shrub will have blooms from yesterday, today and tomorrow in colour, hence the name.
There are a few varieties of Brunfelsia, this example growing to about 1.5mt. These can be mildly frost tender so choose a position wisely if living in a frost region.