Stretch question

[godtea]

I was surfing a couple of days ago and there was a seed site that gave the " stretch " ( growth after you go from veg to flower in terms of double or triple in size ect.) of the various strains they had to offer ie.
I can't find the site again ( must be like leprechaun gold ,disappears if you don't spit on it )
Has anyone heard of this and does anyone know a place I could find this info