The yield comes from the strain you choose..they say indica, mango, jack the ripper and many more....not sure I rememeber what the video said about how tall before flowering though....please get the dvd ...best investment...I just got the dvd recently and since watching it I am making my entire op straight from it...it wasn't mentioned what type of strain was being used...but it really did produce 15 lbs in 80days...so I am starting out small and will progress with better quality materials and supplies...in the meantime the aquamists, lights, ventilation, etc is what will begin the solid foundation and many years and enjoyment to come...

Best luck to you and keep me updated on your progress...