Has she gone through her flower bed to check on the leaf widths? The modern hybrids are hybridized from several species, not just H. Fulva. But I can't imagine that even H. Fulva is that agressive in one year (maybe five years, though). There are a lot of daylilies in the flowerbed in the picture, it seems like there would have been a more of a gradual takeover, and she would've noticed some of the fulva blooms in her garden. H. Fulva is a diploid. It's pollen wouldn't set good seed to a tetraploid. (If you're breeding for triploids, it's recommended to have a diploid seed parent and a tetraploid pollen parent). The differences in the color of the two pictures looks unrelated to the flowers. (the stem is blueish in one picture and yellowish in another). They don't seem to have any variation at all that would result from a possible cross with several other varieties. The whole flowerbed is the same. Unless there was a gradual takeover in the last five years, (I don't know your sister, but I don't think anyone in my family would notice something like that,) I would think also that they were taken. If there was a gradual takeover, there should be some unbloomed plants of the newer varieties. My suggestions is that she should look for differences in the length and width of the leaves.

(sigh) I get busy for a while and miss out on so much excitement. I hope she hasn't left but if Michelle (or whoever s/he is) left for whatever reason, I give her (/him?) kudos for not doing like so many who post a "storm out" post reminiscent of Beaver Cleaver I'm running away from home... and I ain't not never coming back! looking for the pleading of please stay, don't go, only to be back posting a short while later and usually making a big announcement post how they have forgiven the forum, presumably to get yet more attention. And I like Michelle's posts. Far more interesting than some others who shall remain nameless. At least Michelle's invoked some thought and rational thinking rather than talking only about herself. Thanks pup, for the info.

It has produced some new growth at the top and at the short stub at the right. It still doesn't look right to me. The new growth on the short stub also has a dark green/brown color. I've put the cutting in the shadow. What's wrong overhere? See photo. @Peter, dry rot might be possible. I don't know really. Should I try some hydrogenperoxide? Edit: I don't trust it at all. I've removed it from my collection and swabbed it with h2o2. Does someone have any pointers about how to progress from here? Can it be saved?

That shouldn't be the case (old growth dies as new emerges), the net result should be 'Growth', not equilibrium. Perhaps in your case, Blue, they need micronutrients and are recycling.