Weed AND grass killer?

Ya-Man
by Ya-Man

We have a bunch of rock gardens at a beach house and I'm so tired of spraying chemicals to kill weeds and grasses. I'm also tired of pulling them when I miss a month of round-up treatment. Is there a better way? We've laid down double fabric, took all the rocks out and removed all loose sand and used round-up. Is there an option that takes care of this in a yearly way instead of a monthly way.

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