I have had a granite lawn for 18 years and I love it. I do have to pull weeds
but that doesn't bother me. Most of my neighbors spread cancer on their rocks to kill the weeds but if you pull the weeds right you don't have to do it too often. Once you learn to pull the roots up as you pull the weeds they don't grow back.
Pulling up the weeds by the roots takes skill but it keeps me fresh on my Aikido.