How to add grass back to an already modified area?

The sickle will cut grass which you can then use in your hot bar to replant it in areas. It won't automatically grow back in places where you cut it so make sure the place you're actually going to cut is an area you don't want it it.

Quote from WickedSchnitzel

Would be nice if the sickle would have 2 modes. Left mouse would cut grass and it won't grow back, right mouse button would cut grass but it will grow back over time. Or any other solution to only temporarely remove grass. Plus an option for admins to set grass growback time.

It's been tossed around a few times in discussions. Personally I like the idea of the grass growing over time. I think it could be cool to come back to areas after a long time and seeing nature retake an area. Even having it where you cut the grass and it gives enough to manually replant it plus a little extra (like what happens with tree saplings) would be nice.