beckygardener said: But I don't know for sure the cause, would love to hear what Sooby or admmad or floota would have to add about this issue with daylilies.
I took out the @'s in the quote so as not to send more notices to Julie and Maurice (and myself)!
Daylilies, or at least Hemerocallis fulva, are reported to have contractile roots that can pull the crown down. There is an article about this by Putz but I'd have to re-read it and won't have time tonight. This other article, Light Activation of Contractile Roots of Easter Lily:
cites Putz's Hemerocallis article and discusses reasons why this phenomenon may exist in various plants (such as the plant trying to position itself in a better environment). The article also suggests Putz is attributing it to a component of growth in the daylily. Daylilies can grow new crowns above old so it would make sense that they'd want to pull the old one down a bit or the new one would end up in the air, not sure if that's what is being referred to though. Anyway, you might want to read the article in the link above.
Do you all plant on a mound in the planting hole as suggested in the AHS FAQ: