We have had a couple of days with sun, finally, and I already see a difference. The spinach is standing up nice and tall and looking happier. I've also been using red rope lights at night for several days, and that's been enough so the heater doesn't need to run. Wonder if those red lights are contributing something.
I agree with the comment about starting the spinach earlier. That is certainly a mistake I made this year--I'm learning how to garden. I hadn't factored in the shorter days. Next year I am starting things in September and then moving to the GH near Halloween. Also thinking it might not be productive to plant these things in Dec and Jan. On another note, what made me think I could ripen cherry tomatoes in there in November? The plant is doing great now that the catapillar problem is taken care of, but the fruit is as green as it was in October. Reflects my greenness at gardening--haha.