Low stress training is always a possibility, but it really will depend on the strain how large it gets. sativas are generally taller and take longer, you can tell whether its sativa or indica by the width of the leaves, indica- fat leaves, sativa- skinny. You will often hear continue veg stage until the plant stops growing taller, and shows signs of preflowering, and if you have the room to let a plant get as tall is it needs then you can do that, but if not as hardon says, when you cut it into flowering expect it to grow 2 times even 3 times its size.