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Salt has been used as a weed killer for centuries. Mix one part salt with two parts water, and a splash of vinegar, and spray it on weeds in areas where you want absolutely nothing to grow, like gravel driveways or patio cracks. It works by dehydrating the plant.

Cultural reference: The ancient Romans famously salted the fields of Carthage to make them barren. You don’t need to go that far. Use it sparingly, because salt lingers in the soil and can sterilize it for years, preventing any future planting.

Mulch: Your Best Friend

If weeds are a relationship, mulch is the healthy boundary. A thick layer (three to four inches) of organic mulch—wood chips, straw, or shredded leaves—blocks sunlight so weed seeds can’t germinate. It also keeps the soil cool and moist for your plants.

The secret: Lay down a layer of cardboard or newspaper underneath the mulch for an even stronger barrier. The cardboard eventually breaks down, but by then, your garden has already won the turf war. It’s the ultimate low-effort, high-reward strategy.

The 7 Best Natural Weed Killers, Tested by BHG