How to change light cycle?

How the hell do i change the light cycle when im growing outside?

You don't. Nature does it for you. That's why seedbanks give estimates for flowering indoors (eg. 55 days) or outdoors (mid September and such). Peace.

yea unless you cover it by hand every 12 hours. or can bring your plants inside in a closet

cover your plants with something lightproof.

Virtually impossible if you do a guerilla grow.

WA.medigrow said:

cover your plants with something lightproof.

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for all the time they have to flower or till they start to flower !?

all the time bro

So wait, will they does all marijuana flower without having to change the light cycle? does changing the light speed it up or somthing?

there are autoflower strains that will grow from start to finish without changing the light cycle.

Lalaporo said:

So wait, will they does all marijuana flower without having to change the light cycle? does changing the light speed it up or somthing?

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The length of the days change throughout the year, longest during the summer and shortest in the winter. The lack of light ( 12 hour photoperiod ) is what causes them to flower.

So, you can either cover them for 12 hours a day until the day of harvest, or wait until nature takes over.