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well couldnt you just wait until the plant shows preflowers and make her a mother plant?
That is what I did, I understand that some people cant wait that long and dont have the space that I do but still. I would think that its a sure fire way to 1. make sure that there is no stress at all 2. gives the plants plenty of time to grow so that you can pic the strongest/prettiest one to grow and see what it can be when its "sexually mature". Idk, I am still new to all of this myself but in Reading one of my cervantes books it states as little stress as possible makes the plant more fruitful. So far i have 4 BUSHES of plants and 2 are confirmed females with lil hairs popping out of every place possible.
If you CAN wait to see the preflowers but are worried about height then you can also do the technique that I did... top early and top often. Everytime that I saw some new growth coming up I topped it. Not only does this turn my plant into a short stout BUSH but it also ends up giving you 4-10 cola's. after this crop is done I am going to upgrade from my 400w to 2 1000w and with everything dialed in correctly with this method that I got from someone I should be averaging just at or just under a pound per plant. right now I should be getting almost a half lbs of each plant. no lie. If you dont believe me then i can post a vid of his technique so that you can see that I am not lieing. he got 3.95 lbs off of 4 plants... not too shabby.
Whatever this technique is, it sounds like it is right up my alley. I haven't grown anything in my life but before I started reading into everything I was under the impression that each plant should be pumping out those type of yields until I learned that it all usually ends up coming down to the strain and size of the plant. I'm still green as can be so don't even take my words with a grain of salt. I must ask though; are yields always usually determined from the size of the plants?