That's what I was thinking, that it had to do with the hybridizing. I thought maybe it had to do with cross pollination, as the one in the front yard, which was planted by itself, stayed true to color. My understanding is that the "original" daylilies were only the dark orange, which I hate, but I love everything else about them. I love the grass-like leaves, the color of the green foliage and the blooms. I'm a sucker for lilies of any type. I also like that they've bred ones that rebloom, so you have a much longer period of color. But after these changed, I'm kind of afraid of ordering more.Just a guess, but hybrids often revert to the "mother" plant. In the case of roses, cross-breeding a weak rose with a strong one often results in color change, in favor of the strong rose. I think the same thing could happen with bred daylilies.
I don't think there is much you can do about it, except buy pure strains (own-root or antique roses, or daylilies that are not hybrids.)
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