Wow. 19 plants for a first grow or is it? Think first. Do you have the time to deal with 19 plants? Can you put in the effort 19 plants will take? Can you afford to upkeep 19 plants? Any grower should know his or her limits. I been growing for 10 years now and I would really have to step back and think about doing 19 plants. I could. I could grow 100 if I had the time and means. You cant just pop 19 seeds in the ground get some nutes and think your gonna do well. There are many factors that can end your grow for you. Some can end your grow before it stars. I wish you luck and keep us posted.