Depends whom you ask.

For me veg state starts the second it head pops outta the ground.

For hydro and bubblers, seedling stage can run 3 weeks.

I think its a matter of interpretation.

Technically, I guess veg state could start once the sex has been dertemined.....which is somewhere between weeks 3 and 4.

Once sexx is set, then the real veg takes place....

But again, Once the little fuckers pop outta the soil.....I treat them as vegging.

I will be easier on the light and wind for a few days but thats about it for me.

Zandor listed his interpretation somewhere around here...perhaps he'll chime in and give you his.....I "THINK" he said three weeks for seedling stage.

But i may have been stoned.

Wait....if I was awake and reading....then I WAS definately stoned.