Stuck in pre-flowering stage

A customer has a question or concerns and I hope we can get some opinions on it, thanks.

4 auto Amnesia Haze gowing for about 7 week, three are doing great and one has been stuck in “pre-flower” for going on 4-wks.

On a side note 1) is 35" and the other three are over 55". The largest one is the one that is “stuck”

Curious as to know if you have heard of this before and if so best option moving forward.

Try flipping the lights out for one full day, then run a 12/12 light schedule.

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The timing is not an exact science they will all likely finish at different times and since they are autos light switching may have little effect. Matter of fact I know a couple growers that ran 18/6 all the way through the grow with autos
Hope this helps

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12/12 may actually jump start the flowering in a auto flower
You can leave them ynder 18/6 entire grow if you want
I actually put mine under 12-12 after two weeks under 18/6

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Learn sumpin new everyday here! Thanks @Countryboyjvd1971