Ok, now remember I am not a daylily expert. What is meant by "tender" and how would you know before you bought it that it was "tender"?
Edited to add:
I researched "tender" found it to be the opposite of "Hardy", a very vague term it appears. That information is not registered, and appears to be almost a" garden by garden" thing. So I guess you would only know this information my "word of mouth" so to speak.
Hardiness zones I see would certainly be an indicator of "tenderness", I am learning.