Cannabis plants continue to grow foliage until week 4-5 of flower no matter if you defoliate or not. My goal when pruning is to keep all the bottom growth down below heathy by giving it more light and airflow until the plant stops growing leaves at around the end of week 4 of flower. I tend to grow dense canopies and if I didn’t completely leaf strip my plants 3-4 times during flowering most of the bottom growth would eventually turn lime green and die off or grow into unwanted fluff bud (larf).
After I completely schwazz a plant and remove all the fan leaves the plant is still covered in green plant matter which I would think acts as solar panels as well. There is truth to the big fan leaves supplying energy to the plant but the question is how many big leaves does a healthy plant actually need to grow nice dense buds or colas? IMHO, they don't need any… and I have hundreds of pics of different high yielding autos with not one fan leaf on them if anyone’s interested in seeing proof. We also prune a lot of things we grow from flowers to trees to increase yield and promote healthier growth so why wouldn’t the same principles apply to growing weed?
The pruning and canopy maintenance I do is a lot of work and very time consuming but like most of you I’m here to grow fat dense colas and not a bunch of foliage.
Lol!