My plant is a sativa 7 leaf and is exactly 67 days old and 20 inches high so i figured I'll let it reach a good 2 feet or a little more and begin the 12/12 cycle so I can hopefully have an October harvest now i expect this to happen within the next 1-2 weeks but then what? So what I'm trying to say is am I growing at a good time frame or am I a little late and when I do start the 12/12 cycle can I just cover the plant with a black trash bag for darkness can you guys lend a struggling ameture a helping hand and great insight thanks.