When do you switch to flower nutes outside?...

[hog-dog]

When growing indoors you know exactly when the plants go into 'flower mode' because you control the lights. When you turn back the lights to 12/12, you switch to bloom nutes. Simple. Well how do you know exactly when to switch to flower nutes when growing outside? By the time they would show they are flowering you would already be a 2 to 3 weeks late switching from veg to flower nutes. I'm guessing I need to find a sunlight table or something and go by that unless someone here has a different way. Thanks.

[DaMagoMan]

Gota' know the strain.

Will it start flowering at 14, 13.5, 13 or less daylight hours?

Bottomline,
when they Show sex, for sure