This is my first grow with photoperiods. My Blue Dreams just finished there third week of vegetative stage. When should I change to the 12/12 light cycle to start the flowering stage?
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Flip when you like. The longer you let her veg, the larger your harvest weight will be.
The only constraint to keep in mind is the height of your grow space. A plant can double in size during the first 5 weeks of flowering.
Welcome to the forum.
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I was gonna say the same thing! How big you want it to be!
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I’m going to change my timer tonight. Feeding them last night and enjoying their health, it dawned on me that I need to change the lights. They may out grow the ceiling. 
GDP photos from ILGM. 12 weeks old.
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@MidwestGuy @Fishyswaw @David1974
Thanks for the help guys! These are at the end of 6th week of flowering.
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Those are going to be huge! 12 weeks is a long veg time. Look great.
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Looking great! My plants started flower July 20th also. Most people don’t count weeks of flower until buds start to form. So take that into consideration as when to harvest. If you flipped your lights on July 20th, your first week of actual flower probably didn’t start for about7- 10 days later.
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Yea I kinda lost track of time. My first intentional photos, but not the last. Should last me a while.
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@Shaggy1987 Yeah, I just learned that during this grow. I am more like around mid 5th week of flowering. Tx for the heads up! 
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