I've been growing autos for coupla 3 yrs now.My first grow at 24/0 gave me 1 oz - 1 1/2 oz per plant, I now grow using 18/6, with about same results, usually an oz or more per plant, and plants vary in height from 18" to almost 36 ". Right now have an OG Kush at 28 " and a Skunk at 24 ' on day...