According to the website I linked below, you can flower a plant using 12/12 any time after they are 5 inches tall. If that is true, then yes... it looks like you can flower one of those. You won't get much bud off it, but you apparently can flower it.

As far as why no one has answered your post... I doubt many people here flower their plants when they are as young as your's are. So perhaps no one here knows. Plus this is the outdoor forum... so we tend to let nature flower our plants, and flowering in nature normally occurs when the plants are measured in feet, not inches. So, you may want to try posting this in the "indoor growing" section and see if you get a better response.

Lastly... are you in North Carolina? If you don't want to say where you are. I understand... but I thought your screenname ("nc") might mean that. I'm in NC, perhaps we are near each other...

How To Harvest Your Marijuana Plants 6 Times A Year!