whats most effective way to kill grass?

I’d advise against any chemicals (especially gas, oil, etc.! don’t get me started on ethylene glycol! :)). How about putting down a nice thick layer of sand around the rocks? How about stripping off the topsoil? Or buying a goat? Wait, this is a “semi-rock” garden…what’s the rest? How about employing ancient Japanese gardening styles that contrast living and non-living (grass and rock) side by side?

Doesn’t Roundup totally degrade (become environmentally neutral) in the couple weeks that it takes to show results? Isn’t that what the label says?

Salt would stay around for a long time, too, and might not look so good–depending on your sense of aesthetics.

You Know folks they make weed killer for a specific task.
Killing weeds and grass.
Besides the fact that they are made to break down so they do not pollute,they have been found to work.
I would stick to the weed killers if I were you.
We do not need any more toxins in the soil than we have put there already.
Just follow the directions carefully.

Feynn
I kind of doubt the kill the crops with salt story.
Salt in the past was a valuable commodity.“Worth his salt” is a saying that goes back to Roman times. A soldier was paid in salt.I would suppose that it was in short supply if it was valuable enough to pay soldiers with.
I asked my old boss, now an agronomy teacher, about the chemical companies using salts in ag chemicals and he said that it wasn’t that a big of a deal because all plants climbed out of the sea just like we did.something to think about.
I have no doubt that salt will kill grass having unwittingly spilled ice cream salt on the grass before.
here in the midwest we use it on roadways to melt ice so there is plenty along our roadways.

I remember the story of the Romans salting the land of Carthage (in what is now Tunisia) from history class. I found this site which backs it up:

Yep Thats what it says. I wonder if they meant it literaly.

They meant it literally. It is the origin of the term:

A Roman Peace

Them Romans were spiteful, I tell ya!!

Well the origin of the word salary is from salt You were refering to another term?
There must be a lot of salt mines in the area. It must have taken millions of tons of the stuff.

No the term is A Roman Peace.

Either the OP figured this out 14 years ago or the house is hidden by the grass.