If you mean a natural homemade weed killer, one common option is:
Vinegar weed spray
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1 liter (about 4 cups) white vinegar
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1–2 teaspoons dish soap
Mix and spray directly onto the leaves of unwanted weeds on a dry, sunny day. The vinegar damages the foliage, while the soap helps the solution stick.
Important: This is non-selective—it can damage or kill desirable plants too. Avoid spraying soil or areas where you want plants to grow, and keep it away from ponds and waterways.
For persistent weeds, pulling them out by the roots, mulching, or covering the area to block sunlight is generally safer for the soil and surrounding plants.
