you see there are many variables white rhino is a relatively compact plant with a good yeild if you want large plants with large buds all you have to do is
veg them not for a period of time but depending on how tall the plant is.
like i said about 18-22 inches is about good for some monsters plants generally double in size while flowering so it all depends on your preference
hope i have helped

peace, and always remember you should always smoke as much pot as you possibly can