AsNoriuanswered grow question a month ago You have heavy potassium deficiency. Sort it first. I would not trim anything, result wont be huge anyways. If it would be healthy plants, maybe some lolipoping and selective defoliation would be needed. Now i woud sort potassium, after all done - i would trim till green most damaged leaves ( cut of dead/yellow part on each ). If it would be almost all leaf - then i would take off it totally.