how tall will they grow after I start 12/12

I have a grow space where I can only let my ladies grow a bout 20" tall so I was just wondering on average how tall with they grow in two months of flowering I will tell my light set-up just incase this has to do with it.
4 100 watt replacements cfls and 1 42 watt (150 watt replacement) 1 23watt 100 watt replacement and a 2' flourescent fixture that holds two t-12 tubes 1 daylight cool white 6500k tube 20watts. Also 1 warm white 3000k 20watts. This all together has more than 10,000 lumens.

they will double or triple in size.

I flowered mine at 12". They got to 3.5'. Crazy.

so if I start flower when they are between 6-8" tall they will get between 18-26". Also I have 8 plants starting veg I will start flower when they are two weeks old I will probably get 3-5 females out of this and I was wondering if my light setup will be able to flower 3-5 plants I have been told to have atleast 2000 lumens per plant so going by this standard my setup will work. Thanks for the input. Please reply who can answer these select questions.

depends on how much much soil, nutes, amount of light.

they usually double if not triple in heigth.

This is a organic grow I am using Mg organic choice potting soil with Mg organic bone meal for nutrients this bone meal is 6-9-0 NPK oh yea for the Mg haters dont dis me I am growing weed not going to the moon.

they could double or triple in size. they will most likely only double in size though. if you want to keep them short look into low stress training (tie down method) and you will be able to get a better yield and keep them short! good luck dude!!!!

Thanks I was already planning to LST I can let them grow to any height I want with LST and just keep them tied away from light and I will be fine I was just wondering. I am growing indica strain so I can veg longer because they dont grow as tall as sativa. But thanx for the answers even though you all gave me the same answer I wish you had more details like pic of past short vegged plants or 12/12 from seed grows.

Its hard to be exact but on average they will double or triple in size during flowering depending on the strain.

right b4 flower






2 wekks flowering...





hope this helps, weird angles i kno!


they grow a BIT dood!!

PS i bought the plant like that (first pik)

if it was in my care, it wouldnt look like that!

thanks fuzzy you are always helping me out +rep.