Typically indoor vs outdoor has more to do with time to harvest than height by the way. Growing plants big or small is a choice not genetic.
I have a super long bloom sativa that simply won’t get half way through the bloom cycle outdoor where I live in Oregon but is very high potency if you can bloom it for 15 weeks. One of my favorites but takes so much time I can’t get it half way through before the mold come outdoors. But indoors it does wonders. And in 1/4 of the 5x5 I am using with a SCROG I get well over a pound a plant. But it takes time.
That said I spent many years breeding and I am doing some now. When you ask for any hints I can explain in detail how to collect pollen in the same grow space as you are flowering females without cross pollination but that is doing things indoor. You can follow the same techniques outdoor if that is what you are asking but I am not sure exactly the question... but I will try.
So to harvest pollen without cross pollination you simply have to contain the pollen by disallowing it in most of the places. There are some tricks here...
So basically you go in a prune back all but three or four branches and remove all stalk sex sites. You also take off all the leaves on those branches but leave all the leaves elsewhere. You can wait until the male sacs are decently formed you don’t have to jump on it before they are mature. People freak about males and the sacs aren’t even close to opening.
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And then you bag the sites you are collecting from. I typically use sandwich bags with twist ties but ziplock is better. The reason is you want to leave a little opening ( which I do using my method) so the water from transpiration escapes. Otherwise the pollen will mold and be dead.
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Then after a bit the sacs open and the pollen drops and you have contained it and all is good in the world. I typically go in and use my thumbnail to scar up unbagged sex sites to prevent them from growing new ones every few days.
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Also it is good to let it dry out in this process, no need to water heavily at all for various reasons. I do soil so I water about once a week depending on pot size and such but after you butcher it back so much it is stressed and grows slow and needs little period.
Best of luck!