Super Slow Flowering

I turned my ladies over to 12/12. Over three weeks ago. Super Sour Diesel is the strain. But they refuse to flower. All i can see are some pre-flower hairs but thats it. And I have seen this for a couple of days now. I have been thinking about leaving the lights off for a couple of days. I have heard that this can help them to flower? Any other suggestions?

where did these genes come from, seed or cuttings from someone ??, 3 weeks is a bit slow,
its not terrible yet some plants just grow slow at first , hopefully they will pickup soon

just to be on the safe side, recheck you have no light leaks or a timer not switching off etc

other than that, you better hope and pray they have some small bud growth by week 5 or its looking like bad genetics to me time to consider cutting your losses
there is nothing you can do about bad genes at all

good luck

What are your temps?? I'm finding out the hard way that even a couple degrees to low sucks when it comes to setting up a prepetural grow.give your ladys some time dude wait till at least 5 weeks then if there still crap then chop harf and start some freash babys.just my two cents looks like too much of a nice bush to just waste.