This is the last and the most important stage of development of a cannabis plant. It is at this stage that a plant is induced to fruit or flower by making sure that it receives no light for a period of 11-13 hours. Now the plant is considered mature and more dark periods are required so that the plant can produce fruit and flower. How to induce the flowering phase indoors If you have planted it outdoors then it is about that time to transplant it and take it indoors so that you are able to ...