Urban light pollution. How much is too much for outdoor flowering?

I can see some brains turning on this… I am surprised people don’t create “dark houses” to manipulate their outdoor plants to flower when they want them too…it’s a bit of work, but if done right, you wheel em in when you want, and take them out in the morning. I think it can allow people who might not be able to finish a sativa in their area outdoors, to be successful. The plus side is the plant gets better light during flowering which improves the final product…

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I have considered getting plants inside and putting them in a tent for short periods of time to be able to finish sativas earlier. Problem is I am not aways home to do it. I could pull it off for two weeks maybe but not much longer. I think Upstate does the tarp thing a lot.

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Millions of peaches

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Are you talking about moving your plants indoors at night and outdoors during the day rather than some sort of temporary outdoor tent? I’ve moved plants indoors/outdoors night/day and found the sudden change in humidity/temperature/??? has caused a serious PM outbreak.

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In my situation only an indoor tent would be possible but good to know such problems may occur. I will actually try it the other way round, start flowering early indoors and then put them out at 13 or 12,5 hours of light to finish outdoors. That’s where the possible light pollution comes in.

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Just to be clear, I was talking about moving mature plants, particularly those in flower, in and out and out of a small, closed room nightly. Other than that “learning moment” for me, the closest my plants have come to being “indoors” is when I have started them in a cold frame in past years. All of my plants live outdoors from the moment they hit the dirt until they get chopped. The SF Bay Area is pretty temperate.

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If I had my little way, I’d eat peaches every day

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this is actually very common, the technique is called light deprivation. It can be used to get mutliple harvests outdoors, and to get earlier harvests in places that rain or freeze in fall.

in large scale commercial grows they often have large frames with netting, or hoop houses over the plants. The dark period is controlled by covering the frames with shade cloth. Some places even have automated mechanical shade cloths.

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That’s cool, and it figures since it works. I was more talking about just regular people building a smaller version for themselves, so they can grow sativas in areas where its not possible under normal circumstances. If people could control the timing of flowering outdoors without spending a boatload of money, then those long flowering sativas suddenly become possible to grow…it would provide the benefit of having them flower in the summer where the light is at its best both in intensity and duration and higher temp range…

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