size of the plant doesn't matter. age does.
if you want to get the THC% your plant is rated for, you must veg for at least 8 weeks.
if it gets too tall for your space you need to LST or crop your plants.
flowering young plants will have smaller buds and less then par THC.
if you take clones, they are whatever age/maturity the mother was.
I would have to disagree with you 100%
Age of the plant has nothing to do with THC content. Not at all. In fact, the few larger buds your plant produces are more than likely going to be of HIGHER quality than a larger plant with many more bud sites, some of which will be shaded and not get good light penetration. (if you are using artificial lighting).
The reason I grow MORE smaller plants under artificial light is simple. Greater yield for the time spent. Quicker finished product.
Think about it. If I take 50 clones, veg them for 7 days, then flower them for 60, and yield 2lbs under 1200watts. I have pulled 2lbs off in 67 days.
Take the same strain 10 clones, veg them for 2 months, then flower them for 60 days and yield 2lbs under 1200watts.
You get the same 2lbs with 10 clones grown big, but you took 120 days to produce it!! You can have the same weight and possibly BETTER quality in HALF the time.
No to mention, you are MUCH more likely to pull 2 lbs from 1200watts with 50 plants than you are with 10. Let's face it, you can make much better use of every watt of light with more plants than you can with 10.
We also end up using much less effort. We take less time, less work to train plants etc to use up all available light and in the end, I only end up chopping up 50 BIG colas instead of thousands of tiny buds.
You can definatley argue the points I have made, but it is simply my 2 cents.