Yeah, let them grow for a while. They continue to grow in flower so based on your room size and how big you can let them get and how long you can grow without too much trouble, you can easily flower anywhere from about 1 foot tall to 3 feet or so. It will get very smelly, so be forewarned. In the end, it's the grower's decision when to flower, not really the plant's so much. Outdoors flowering is just based on exposure to sunlight.