At what height should I flower querkle to get a decent yeild?

I have been vegging querkle for like 5 weeks and they are like 8 inches tall. The have alot of bud sites. I have a limited space 22 inches to be exact thats all ready including the pot and light. So thats 22 inches to work with. When shuld I flower? I have seen some say that it doesnt grow very much. To just grow it to pretty much the hieght you want it to be at time of harvest. Then I saw another thread where the guy flowered his querkles at 6 and half inches and they grew to be pretty big 2 oz plants. I would like answers from people who have grown querkle before. Any thoughts? I need help please....
 
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