24/0 makes sense, It's the downward leaves that caused me to ask. I've never really looked very closely at the plants in a 24/0.
I can see my girls "go to sleep" from all my girls, except for Stomper, a little bit before the end of their 18h light cycle with the top leaves trending pointing down. Stomper probably could go with a longer light cycle. I think you get declining benefits in extending the light cycle beyond the getting its limit on DLI.
Here's my girls a few min ago with about 4 hrs left on their cycle. Note the upwards pointing leaves of all the girls. When you check them at first light, it's much more dramatic.That's with running the VPD around 1.01 kPa and I imagine and average ppfd in high 700s low 800s.
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Do you ever see your girls "praying"? I could be wrong and it may not apply to all canna structures, I think if you don't see your girls with uplifted leaves, something is not
optimal in their environment. Key word is optimal...............or they have hit their DLI.
Canna experts please correct me if I'm wrong or if you differ in opinion!!