OldGardener said:Is there a database or information regarding the rot resistance of particular cultivars available anywhere? Maybe something like rust resistance scores but for crown rot instead? I am currently trying to get a feel for how different cultivars react to conditions that are conducive to crown rot but I am hitting a wall. It is my understanding that some cultivars seem more resistant to crown rot than others and other cultivars seem to rot very easily (I think that tet conversions fall into this latter group but please correct me if this is wrong) bu,t if there is a list somewhere out there, it sure would help. Thanks 
I was just reading this article and about roots and from paragraph 5 -
"...The variability of roots and crown structure is very interesting and may be something to which more attention should be paid. It is my experience, for example, that dividing a clump where each fan is separate from the rest in the clump is much easier than dividing a clump where every fan grows from one main crown. While this may not make much difference if you are only concerned with growing the plant in your garden, for breeders and sellers, this can make considerable difference. I would note that I have personally noticed much more crown rot in those types that have one crown from which all the fans grow and that must be cut apart to make divisions, than in other types. The cutting apart of the crown must be much more stressful when dividing than simply pulling apart individual fans..."
http://daylilybreeder.blogspot...
