Ahhh my guru has that, a load of clay pebbles on top. I didn't ask,(he offers advice, lol) thought it might be to make em pretty . . . . lmao . . .
Yes it makes sense, keep the top inch of soil dark and moister for longer, roots will grow. Have you had any experience with fungus gnats? Do you think clay plebs would piss them off enough to get lost, along with some GnatNix perhaps???
Nice 1 . . . .