I don’t fucking know ask the Midnight Magician.
Magic
The spell is clearly some sort of filter, with the red light still getting through. So presumably the trees still get enough light to go through photosynthesis.
EDIT: Looking it up, looks like plants get a lot of their energy from blue and red wavelengths. So I guess it’s enough red light for the trees.
Literally unwatchable
It might be just a visual thing so maybe they’re still getting sunlight even if people can’t see the sun.
Life finds a way.
I think the sunlight could still makes it there, the city was cursed, so the spectrum of visible light is altered, and seeing that this is a fictional story I can accept bullshit science/logic a long as it does a decent job trying to sound legit
Magic
You’re watching a show that has interstellar wars, cosmic creatures and Abraham Lincoln being an immortal super hero that fights crime. And you’re perplexed how the trees are still growing in a zone that was casted into darkness. Good point, I also question how they work
So if I had to make a guess, I’d say that the magic dome is a very powerful illusion. As far as we know there isn’t much refuting the idea that the sunlight is still getting through, the people inside simply can’t see it, like a giant pair of sunglasses. If there were vampires I’d wager they might still be unable to go out during the day, but this would confirm or disprove my hypothesis.
On a slightly less related note, bees. Bees and VERY good at telling time. So if the light still feeds the trees, the bees are also probably still populating them.
magic
According to me, I think it probably was already grown until midnight city appeared.
No one here admitting that reason is that the creators didn’t think about it
How about you shut your mouth?
Literally magic.