[QuinnTheEskimo]

Does any one know how many hours of sunshine is needed to keep punto rojo clones in veg and not switch to flowering?
I have 2 females from seed that as soon as I saw they were females i put them under 24 hr. light to switch them to veg. They have stopped showing any sign of flowering for a while now so two weeks ago i put them on 18/6 and today I put them on 15/9.
I will have 13 hours of sunlight on may 1st.
If they do switch to flower will they revege when the day gets longer?
I also have some Malawi's and highland Mexican x blueberry I am wondering about.

[corky1968]

I say anything over 14 hours will probably keep most Pure Sativas in their vegetative phase.

I think long hours of daylight over 16 may cause some Pure Sativas to go Hermie.

I grew Highland Thai (a pure Sativa) a while back and didn't get one Hermie
in the bunch. While others who have grown them complain that they Hermie
like Hell. I never exposed my Thai plants to more than 14 hours of light ever.

In their natural environment Pure Sativas never get 18 plus hours of daylight anyway.
Which is what I reason in some going Hermie when people expose them to unnaturally
long photoperiods.

Opinions may vary on what I just said.

But this is my take on Pure Sativas.

[QuinnTheEskimo]

Thanks corky, I am setting the timer for 14 hours of light and keeping them as dark as I can. It will probably be 13 1/2 hours of light when I put them out. Hoping they stay in veg.