Pink and blue

For some reason, all three of the *pink* Swan River Daisies that I potted on this year -- into varying pots -- have succumbed to some kind of wilt, whereas the blue variety, sometimes standing right next to them, are thriving -- even the three late-comers that are still crammed into a single pot. Looks very much as if they are simply affected by the heat, and the central new leaves still look alive, but it's incredibly colour-specific.
(Neither variety is anywhere near flowering yet.)