I grew some echinacea from seed last summer. Just a generic mix of purple and white flowered ones. They did not bloom last year.
They are starting to emerge from dormancy, and I have a feeling I can tell which ones are which, even though they’re not in bloom.
Some are emerging with reddish leaves, and some are emerging with bright green leaves. I’m guessing the pigmentation carries through the whole plant, and the ones with bright green leaves will have white flowers.