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Is it ok to cover plants a couple hours before sunset and uncover them once it's dark out, or do they have to be actually covered the whole 12 hours?
What are some problems with doing this, i.e. -air flow, materials resting on or touching the plant? Any success covering for a week or two and then letting nature take place.
So I did some googling because I was also wondering about this, and it seems that you can just leave them on till its dark, but you have to be vigilant about doing it EVERY day until the actualy light period is near 12/12 otherwise plants may re-veg or hermie on you. As for how dark you need to get it, seems like judging from what I read, you don't need perfect dark, and even plentiful evening shade can speed things along. And yeah you would be better off with something that does not touch the plant.