You can get away with doing it at virtually any point more times than not, it seems, but in general you want to have some stem development to help avoid any potential shock. "They" say allow for 6-7 nodes of growth, then cut down to what you want to keep.
cocoforcannabis has the best info to read over as far as how to grow weed. Their information is light years better than all the other marijuana forums and websites like gd, ilgm, growweedeasy or whatever tehy are all called that regurgitate teh same old tropes of misinformation. Not saying everything there is perfect, but it's light-years ahead, nonetheless.
when to top, how to train with barious methods, why whimsical defoliation is for idiots that don't know any better, that sorta stuff.
there is way more ways to manipulate plant, than pure harm and loosing growing time. I would recomend you to check LST, supercroping, scrog as techniques. Toping, mainlining is waste of time in mind mind, but many growers do it. read articles, why and when, there is no simple answer to it. even first top some people do on 4 or 5 node, some on third, some do on 6th or seven, all depends what you want to achieve and how you plan your future manipulation ...
Doesnt matter on photoperoids that much, you can stretch grow phase for ages.
If you cut to early or w/e and she is stressed, you can just longer the grow phase.
You can experiment, but i would advise to cut after the 3. Node and take 1. Node off, so your left with 2Nodes 4 Branches, easy to handle.
You can bend them into 4 directions then and manage further from there on. Top them again on those branches or just let it grow a bit.
Always take leaves off that grow in the middle of the plant., so they dont shadow your new growth underneath.
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