Getting to lava

[eigoya]

I'm again completely fed up with weed whacking and have decided to try to eliminate all green to expose the lava. In my head I assume caretaking lava is easier than caretaking jungle, but don't know how to efficiently remove. In past I've tried vinegar salt and weed killer, but neither was more than moderately effective . Burning seems quickest, but neighbors will complain and FDwill ticket. How do people maintain those beautiful lava "gardens"?