What flips a photoperiod plant?

Modern Selections

Modern Selections

Well-Known Member
Most of the "Fast" strains sold will do that as well. They are crossed to an auto and then selected photoperiod. So the ruderalis is in there just not dominant.
 
Funkentelechy

Funkentelechy

Well-Known Member
If the question is what flips a photoperiod plant, it's not 12/12, a plant is triggered to flower long before 12/12.
The fall equinox(12/12) was September 22nd this year, outdoors plants start flowering early to mid-August(14/10) outdoors. I've been growing since the mid-nineties and I have never had a plant wait until the equinox to start flowering, this is normal, not talking about not "fast" strains or anything crossed to an auto either. Cannabis evolved to start flowering before 12/12, late September is way to late to start flowering in most latitudes for seeds to mature before nasty weather or frost kills the plant.
 
thumper60

thumper60

Well-Known Member
Funkentelechy said:
If the question is what flips a photoperiod plant, it's not 12/12, a plant is triggered to flower long before 12/12.
The fall equinox(12/12) was September 22nd this year, outdoors plants start flowering early to mid-August(14/10) outdoors. I've been growing since the mid-nineties and I have never had a plant wait until the equinox to start flowering, this is normal, not talking about not "fast" strains or anything crossed to an auto either. Cannabis evolved to start flowering before 12/12, late September is way to late to start flowering in most latitudes for seeds to mature before nasty weather or frost kills the plant.
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By the time i hit 12-12 here its harvest time for the outdoor. My outs start flowering at 15-9.
 
B

bluegill

Well-Known Member
Phytochromes and cryptochromes signal to the plant that the seasons are changing, and the plant undergoes hormonal changes as a result - the balance of abscisic acid, auxins gibberellins, and cytokinins, determines the way the plant will grow.

Plants have other sensors, too, that, that will flip them into flowering.
 
brogro

brogro

Well-Known Member
TheWholeTruth said:
Its the flower hormone. It forces flower when it reaches critical stage. Every day in veg the flowering hormone builds but by the time the light comes back on it causes it to drop again. When the dark hours reach the point were that balance tips and the hormone level is built that high that due to the shorter daylight hours it isnt enough to drop it below the critical point hhaving this happen daily it triggers flower.Plants from different areas of the planet adapt to their conditions and light hours so the trigger hours will be different with plants coming from different areas. Eg some areas its near 12-12 year round so the plant wont trigger propely until the dark hours is slightly more than light ie 12.5 dark - 11.5 light. In areas were most indicas are found they can trigger at 9.5 dark - 14.5 light. Different types have different trigger points. This is how the photo plant works.
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Nice information. Thanks
 
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