Do outdoor plants really double in size during flower

Mine are 5 feet tall and 14 nodes but the branches are thin and looks a bit spindly . Will they really thicken up and grow that much more when they start to flower in a few weeks?

Some strains are huge outside given the chance some will get bigger than double think thai or one of the big northern afghan turkestani strains like mazar shebergan tashkurgan etc in the right climate they can be very big