Diesel fuel is a very effective weed killer however, its toxicity to both humans and pets should be taken into consideration before applying. While diesel fuel is very effective at killing live plants, it will not kill weed seeds.

Will diesel fuel kill weeds permanently?

Diesel won't kill weeds permanently. While it kills the roots, stems and leaves, it doesn't kill the seeds of the weeds. This means that, once the diesel has reduced in amounts from the soil due to being washed away by rain for example, the seeds will germinate, and the weeds will grow.

What liquid kills weeds permanently?

Yes, vinegar does kill weeds permanently and is a viable alternative to synthetic chemicals. Distilled, white, and malt vinegar all work well to stop weed growth.