I agree with Low. This is an old thread but the issue is not resolved. You have some folks saying they trim successfully while there are others who are saying don't trim ever. I trim the leaves on most of my plants. I trim lots of leaves on the Purple Kush and don't trim any leaves from the Pineapple while I trim just some from the Sour Diesel. The PK is thick and bushy and tends to mold even in dry conditions whereas the Pineapple has very thin leaves that let in all the light necessary. It depends on more than your feeling on the subject. It depends on the thickness of the particular strain and how much moisture in room humidity, dew, rain or whatever will be in the environment. Extra bushy plants like Gods Gift, PK, White Kush and such usually benefit from thinning the leaves. I will try to document some trimming this year.