Everyone seems to have a different opinion on defoliation but my thoughts on it are that you are effectively cutting off body parts of your plant, so there has to be a damn good reason to do it.
(Ordered in priority)
- any leaves on the bottom few inches of the plant as they become old and start yellowing and dying or shriveling up from lack of light.
- inner leaves that look curled up and bad from lack of light.
- any badly damaged leaves on the mid-top section of the plant
- large fan leaves on the mid to top section of the plant that are shading a large bud site. I prefer to tuck the buds around these or between the blades but sometimes they just are shading out too much bud and gotta go
- any leaves that are impeding airflow to the point where you cant even see through the plant from the side.
- large fan leaves coming out of your main colas that are shading out the lower part of the cola
All that above takes 10 minutes or so for me. I’m pretty liberal when I do it. In fact the best harvest I ever had was when I stripped my plants completely bare half way through flower, although I wouldn’t advise that.
I see no harm and only benefit from doing this in late flower (last 1-2 weeks) as you’re going to get more light to the lower half of your plants to help them finish up, as they’re usually a bit behind the top. It also improves airflow and lowers humidity to prevent late flower mold issues.
Just focus on taking off the unhealthy stuff first and dont take off any healthy growth unless it really forces your hand.
Also, in my opinion there’s something to be said about a neatly pruned plant, it’s more pleasing to the eye.
So yeah just my .02 but everyone will likely have a different opinion on it.
Edit: I also wanted to address this:
Because that’s not a valid reason to do defoliate and if doing it solely because of that then dont. I mean yeah sure when you chop there will be less trimming but it’s still the same amount of overall trimming just stretched out over multiple passes. Basically, you should be defoliating to make less work for the plant, not yourself.