This guy deliberately stunts his autos by transplanting them as they come into flower.
How To Grow Large Sized Autoflowers in Small Spaces-Stunting - YouTube
It sounds wrong but you can't argue with his results.
I've just germinated a Trans Siberian Auto. It is in quite a small space but I have just seen this youtube video of one and it is a monster for an auto.
Trans siberian autoflower - YouTube
I am tempted by the first guy's method but it just doesn't feel right to stunt her like that. Any suggestions or comments very welcome. What does everyone think?