I have a spot where I want to smother the grass. It has newspaper/cardboard/other mulch but I added these to the top last night. It's the first time that I have tried them but they look like they will block sunlight.

seems to me that because they decompose rather quickly that compost would be a better answer. Plus who ever has enough compost? I like to use mulch that gives me a year or two at least but that is just my preference and thoughts on the subject. Happy Growing David