Hey BFVISION,
I had white coneflowers next to my purple ones..
And the following year, they started turning,
a pale pink, the following year they were totally
pink..
I do know there is a "dominance" thing with
plants, the stronger will over power the weaker...
Same for phlox, the tall variety..
I had a pale purple and a pale pink..
They lived here, for a long time, with the previous owners even..
Then one day, in an other area, a vibrant pink
clump sprouted and wowwwwwwwwwww were they dominate.
Now the two other clumps that I had that were the other two colors, are now changing...
The purple one is darkening... and the light pink one is developing a dark pink/magenta ring on
the inside..
So yes, they can change..
What colors do you have????