Nevermind the same garden, my Nikko Blues not only have two colors on one plant, they have two colors on the same flower, half pink, half blue!

Regards,
Bob

It simply means that the soil for the blue one is more acidic than the pink one. I have a pair which are only 3 ft apart and different colors.

Bob, I have that on one plant too. The lower/earlier flower is pink/purple abut the upper flowers are blue. I think that is because my lower/earlier flower started before I added aluminum sulfate which blued the upper flowers later. I think?

I haven't added anything to the soil on either end of the garden, so I guess for one reason or another, they just have different PHs. I like it!

This Penny Mac is in a ground for the 3rd season.
Started pure pink and gradualy transitioning.
Remaining neutral soil from the original pot keep it part-pink, but native acidic clay finally taking over

Excellent looking Penny Mac Ego45. How old is it? Cheers, JK

JK, third year in a ground from 2G pot.