Planting around a cesspit manhole cover
I'm helping my friend to design her garden, and her cesspit is to the left but center garden! I'd like to do a grasses boarder around it to hide the cover, but still give access. Are ornamental grasses safe to grow around the area? Access can be left to the rear and side of the cover, but I want to hide it from other areas of the garden. Any and all ideas welcome!!