Viewing post #872903 by admmad

beckygardener said:Maurice - THANK YOU for posting that info about temps and how they may affect daylilies.

You are most welcome.

Are there some cultivars of daylilies that handle the heat better than others?

Yes there will be some cultivars that handle higher temperatures better than others. Keep in mind that Arisumi used the cultivar 'Purity' in his temperature tests. Purity was registered in 1949. Since then there have been many daylily hybridizers who produced their introductions in Florida. They will, either on purpose or simply by growing and hybridizing their plants in the Florida heat, have selected for daylilies that grow well and produce viable seeds in Florida temperatures. (Although if they chose to only hybridize in the cooler times of the year they may not have had strong selective pressures for heat tolerance).

Maybe 95 is the cut-off heat tolerant temp for good blooms?

Perhaps. That is best tested or looked at in locations with sufficiently high temperatures.

Also, is it possible for daylilies to adjust to temps to survive? I ask because I have actually purchased some named daylilies (not very many) that came from northern states. They are struggling in the Florida heat. I lost one last year and I am sure it was the heat factor. None are dormants. I have the best luck with seedlings grown from seeds in my garden. It's like they adapt from germination onward ....

Yes, plants can adapt to high temperatures (within limits) if those temperatures do not come suddenly. There will always be a limit to how high a temperature a particular cultivar will be able to adapt. Also different cultivars will have different rates of adapting to high temperatures and they will have different maximum temperatures. They will probably also differ in how long they can survive at high temperatures (or their seeds can develop properly, etc.).