Black berry with grass clipping cover?

Hi all, We bought our home a couple years ago and it had a long strip of wild black Berrys the previous owner left. I have been letting them grow and weeding out the other items in their. This year they are starting to sprout up about now and I was wondering.

Would it be ok to pour a large amount of grass clippings over the area to keep weeds down and as fertilizer? I am pretty sure the Berrys will grow throught it. And it will stop other things from growing. But I wanted to be sure it wouldn’t smother the berry shoots?

Any advice would be appreciated.

Thanks in advance.