As the tittle suggests. Is it time to trim? The lower leaves are getting brittle, and I'd like to focus energy on my other newer leaf sets. They seem to have slowed somewhat.
My motto is... If it ain't dead then don't cut it. What you are stating, "focus energy..." is only a theory and that is not a fact. It could take longer for your plant to grow up if you trim leaves due to recovery and depending on what you're cutting. I think it'll depend greatly on the strain and setup as to wether or not a plant responds positively to pruning or not.
Don't trim. let it grow man and wait till the leaves dry up n fall off. mj grows best when left to do its thing