I know some guys seem to get a great stretch the last two months (or so) I've only been growing for 4 years and I haven't had a plant more than double it size from the beginning of Aug through the end of Sept. My plants now are all 3-4 feet tall I'll be happier than hell if they all hit 6 feet tall by harvest. Last year my 6 plants were all between 5-6 feet tall or slightly taller and I havested over 4 pounds dry. P.S. Giant plants and huge harvest are awesome..But as I learned last year..If you trim, manicure, dry and cure properly..It can also be a bitch!!