Autos not going into flower

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Has anyone else experienced a strain that did not go into flower when it should? or not at all? Ive grown these Moby Dick autos many times, in fact its one of our top strians. we had a batch of 13 not go into flower, even after 80 days. these typically finish in 63-70 days. We decided to treat them like photos and gave them 12/12 for 5-7 days and it seemed to get them to start flowering. but, they basically quit after that, only showed preflower for weeks on end. bad genetics? ever run into it? its killin us running a perpetual grow.
 
Has anyone else experienced a strain that did not go into flower when it should? or not at all? Ive grown these Moby Dick autos many times, in fact its one of our top strians. we had a batch of 13 not go into flower, even after 80 days. these typically finish in 63-70 days. We decided to treat them like photos and gave them 12/12 for 5-7 days and it seemed to get them to start flowering. but, they basically quit after that, only showed preflower for weeks on end. bad genetics? ever run into it? its killin us running a perpetual grow.
It happens all the time even in stable genetic lines. Sometimes the recessive genes (in this case the Photoperiod genes) become dominant. The thing is it is usually the odd seed not a whole batch. When that happens it is more likely a seed mix-up at the packing facility and they were photoperiod seeds.

When you flipped them to 12/12 you should have left them there. If you go back to 18/6 photos will just re-veg.
 
thanks for your info. they went back to 20/2, because of the perpetual grow, i wasn't going to let it effect the ones 3 weeks behind these ones. that makes sense though, that they re-vegged. and yes, it wasnt just one seed that it happened with. first, it was 13 plants that acted this way, all from same batch. then we had more come in 3 weeks later that were fine and now the ones after that generation, are doing the same (9 this time). if i had seperate space, they would get their own 12/12 environment, but i dont have the room or supplies for that.
 
Photoperiod genes are dominant to recessive autoflowering genes. This is why when an autoflower (homozygous trait) is crossed to a photoperiod that is also homozygous you get photoperiod plants The resulting plants would all have one gene for autoflowering which takes a back seat to the dominant photoperiod gene. However, if the photoperiod you have is simply heterozygous (has one gene for autoflower and one gene for dominant) then you may have some autoflowers in your f1.
 
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