Two of these are planted in the same area, but this one is shaded more than the other. They take turns coming into flower so we get double flowering time, with this one following on from the sunny one.
I have two of these in the garden. One is in a slightly shadier area so they appear to extend the flowering with first the one in the sunnier spot, and as it fades the other one takes over. The white seems to glow as the evening light fades.