"age" of a clone???

Still considering all my options for growing in a tiny little confined space - and getting plants that will actually fit in there. I've taken a cutting to try to clone just for experimenting some with LST, which led to a question in my mind. What is the maturity age of a clone? If it's taken from a plant that is preflowering, once the clone roots is it also sexually mature? If so, and you put it almost immediately into flowering, will it remain significantly smaller throughout or will it still catch up in size before it's ready for harvest? Sounds kind of odd I guess, but what's running through my mind is what would happen if I vegged a plant for about 4 weeks, then took a couple cuttings and rooted them, then once they started to grow good again put them into flowering while they were still significantly smaller than the mother they came from?

Also, in my quest for midget plants, does anyone have any experience/knowledge of Dr. Nodes Plant Height Regulator? I'm a little leary of that, plus it's kind of expensive, but thought I'd ask.