Well you may be able to induce or maybe encourage flowering through fertilization. Giving higher doses of Potassium, or a product like Open Seasame by Fox Farms may work. Depending on things like age, location, enironmental factors,health,fertilization/food factors will determine when you plant will begin to flower. For example the majority of my girls are just really starting to come into the flowering season...however i'd say prob twenty or so that are budding right up and are in full flowering blossom producing buds/nugs/ and crystals already .
So with patients at hand and heart....it will change over, they all do, its just a matter of time.....once there than its back to the realm of mother nature and how long she determines u stay in flowering