How to controlling weeds and grass in sedum?
I totally get it, we all want to get rid of weeds and grass in sedum, but it's not always easy. The best way to deal with them is by hand-weeding, which means removing individual plants. After that, you can go ahead and apply a thick layer of mulch. That'll help keep new weeds from growing.
you might want to try using a weed killer made especially for sedum. That way, you can keep those pesky weed seeds from popping up, but you won't have to worry about hurting your lovely sedum.