I have photoperiod seedling under artificial lighting (while it’s too cold to grow outside). The cycle is about 14 hours on/10 hours off. Once the outside temps are warm enough I want to move them outside, where the lighting on-time will be much shorter. I expect the seedlings to only be about 15cm tall when I move them. Will the shorter light cycle trigger flowering?
I would run the lights 18/6 to prevent early flowering.
@jonakerr You may want to go longer like @MidwestGuy suggested. Outdoor is what I do and here you are safe by Mother’s Day. Here in seattle we are just a few minutes short of 15hours by then. Most photo strains will start to feel flower hormones at 14hours. (Indoor we use 12 because 99.9% of photo strains will flower at 12. In my experience most flower at 14 too.)
I would maybe settle on 16on (inside) though as a compromise if you plan to get them out as early as you can. I found the 18on inside moved outside to the suns 15on is definitely enough to make some seedlings and clones to flower.
If you do find a few want to flower anyway, just pinch and roll off the flower growths. Just like pinching back basil or spinach that bolts. I have found that this makes them veg like it never happened. If you leave those preflowers the plant will stall and it usually takes 4-6 weeks for them to get their bearings again naturally.
Happy sun growing to you. 
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Cut and grown in the sun.
I start my seedlings late April under light the transplant outside end of May beginning of June
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I grow a lot outdoors. It’s new for me to start my plants indoors. Last year I had big plans for some big plants. I started putting plants out in May. Two month old clones I’d started in early March. All of the went into flower and then revegged. It was quite a mess.
So the changes for this year are as follows. Veg lighting inside will be set to 14/10 and plants go outside late June…
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TBH When I find a stretch monster,I sometimes wait till the solstice to release the krackin. I keep them root bound and Bansai hacked down till then.
It’s hard to be discreet with a 10 foot plant sticking up. Ha
@oldmarine,
If you see any spring flowers again pinch that back. It really is very effective. My theory is the flower hormones build in floral tissue. Pinching it out removes it from the vasculature of the plant. Less hormones, less flowers. They don’t sit there confused for months. Like a deer in the headlights.
I have found them able to vegetate like the spring bloom never happened. Like pinching back bolted basil or spinach
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I actually had a couple of reveg plants I was growing on purpose. They made for some nice 3-4’ bushes that are easy to care for.
I’d had an accidental reveg the previous year and knew what to expect (even if didn’t know the cause yet) and I managed to get quite a potent haul, but I didn’t get the monsters I was aiming for. This year will be different. I still have my planned reveg, but I want a 15 footer…
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Thanks for the advice. I’m a bit south of you (a bit south of San Francisco) so Mother’s Day will have just under 14 hours of daylight. If I do as MidwestGuy suggests would that not carry the risk of flowering as soon as I set them out?
if you wait until June to put them out they’ll be fine.
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Better to wait to 15hours in my experience. I bet you will still have to top em outside.
Even if you have to wait till June.
I grew 10ft tall plants that were started 4/20 inside and put out at the end of May beginning of June im in Northern Arizona at 5000ft
Lol, I would be scared to see your monsters. Either way those look real nice.
I am always afraid to grow them taller than my sunflowers. Ironically it’s legal now in Washington state as long as you want to buy it from the state. F*** the homegrown is their policy with the police. Even medical unless you agree to Wi-Fi cameras from the man in your grow. If your state goes green don’t let them step on the homegrown in the name of tax dollars…
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