A lot of homemade weed-killer recipes are passed down because they are simple and inexpensive. One popular DIY version uses vinegar, salt, and dish soap, but it’s important to understand how it works and where it can cause problems.
Nana’s DIY Weed Killer (Common Recipe)
Ingredients
- 1 gallon (about 3.8 liters) white vinegar (5% acetic acid)
- 1 cup salt
- 1 tablespoon liquid dish soap
How it works
- Vinegar: The acetic acid can burn and dry out the leaves of many weeds.
- Salt: Draws water out of plant tissues and can make it harder for plants to grow.
- Dish soap: Helps the mixture stick to leaves so it can work more effectively.
How to use it
- Mix ingredients carefully in a spray bottle or garden sprayer.
- Spray directly onto the leaves of unwanted weeds.
- Apply on a dry, sunny day for better results.
- Avoid spraying desirable plants.
Important cautions
- Salt can damage soil and may prevent future plants from growing in treated areas.
- Vinegar solutions may harm grass, flowers, vegetables, and other plants if they contact them.
- It works best on small, young weeds; deep-rooted weeds may grow back.
- Avoid using near waterways or areas where runoff could carry salt.
Safer alternatives
For garden beds and lawns, consider:
- Pulling weeds after rain when soil is softer
- Mulching to block sunlight
- Using targeted weed treatments designed for the specific plant problem
- Pouring boiling water on weeds in cracks and pathways (where you do not want plants to grow)
This recipe can be useful for driveways, sidewalks, and cracks, but it is usually not the best choice for healthy garden soil.
