Canni is right I believe. I too grew THE strain he had outside (50ish feet from a Street light). Mine hermed on EVERY bud (in pitch dark). More seed weight then bud. Yet Weeding4U also had a cutting of it outside which never hermied. She actually had to build a light blocking wall due to a street light and had NO hermis.

Feminized seeds are NEVER from the same plant that hermed. Those are Herm-ized seeds. To get Feminized seeds you need your hermi to pollinate another plant (not just another clone of the same plant either) It needs to be differing genetics.

My first plants (from bag seed) were also herm prone and had Nanners from about day 30 through to the end.

NOW I have the Durban poison, A stable (yet questionable) G13xAfgani, and the Blueberry. Which all three are stable! Light leaks, Forgetting to turn out the lights a couple times before I had a timer. Yet NO herms:thumbsup:

Thus I think stress CAN do it, Light might do it to specifically genetically flawed plants, But a stable strain can take it.

Just took these from the G13 at 82 days.:rasta: They are my first REALLY acceptable harvest. (mistakes like under-nuting, Nute lockout. Then hermi's and BUGS on others)

Pic 1 is the Cola from a two foot plant.
Pic 2 is the second plants Cola. (this plant got SO top heavy it fell over three weeks ago. After tieing it up, I discovered the stump got torn, YET all it did was slowed it down a little.:thumbsup