Viewing post #1044802 by needrain

admmad said:
I would agree, as long as there were daylily species that did not have the genetic ability to rebloom in the original mix from which modern cultivars have been derived. My search of the information available for those original plants suggests that probably all the species used had the genetic ability to rebloom.

What may vary is the time between rebloom scapes on the same single fan crown. That may depend on the size of the flowers, the number of buds, the height of the scape related to the number of leaves (their length and width). In other words, how much resource is required for the rebloom and the capability to produce the necessary amount of resource. Water, nitrogen, fertilizer, lack of competition from weeds and reduced competition from other fans of the same cultivar (reduced self-competition) all may have an effect.

I agree there are lots of factors that come into play with a reblooming plant. I think any or all of the things covered in your post could affect it. But I would still guess there is a genetic component to plants that reliably bloom for a lot of people rather than just sporadic expression of the trait. Aren't there hybridizers selecting seedlings based on the ability and inclination to rebloom? I would suspect that in a large number of siblings all grown under the same conditions, there are those selected because they are more reliable about reblooming than other siblings. I would guess this has been going on for multiple generations, thus enhancing the likelihood of seeing rebloom. That would indicate a genetic component to me. What genes are working would be the big question. It might have to do with genes able to more efficiently utilize the conditions they are given in which to grow and not be directly part of the bloom process. I guess a lot about this sort of thing, and it just guessing and speculation on my part.