Trish, do you grow daylilies? I had a daylily friend who lived in Denton TX. Not sure where you are relative to there - but she grew (or tried to grow) hundreds of different daylilies. She had a terrible time with root rot - which is not that common up North, but can be in the south. I think if you want daylilies in TX, it would be good to find out which ones like that climate.
