I have no idea, but since they’re perennial and don’t form bulbs, I’m guessing they would be “day neutral”.
Our ground freezes solid, so they go dormant both summer and winter; SoCal, they only buckled to the heat, with a summer dormancy. Most milder places I read about them, they use them fresh throughout the winter.
Thanks. I’ll look for them. We seldom get below 20F in winter and then only for a few hours at a time.