Vinegar is environmentally friendly and won't harm people or pets, but always use caution when getting it on your skin or in your eyes. Take care to use gloves and safety goggles; don't spray on a windy day. It will harm the "good" plants!
1 gallon vinegar
1/4 cup dish soap
- Be careful with this! It's not toxic, but you don't want the wind blowing it back into your eyes - wear safety goggles. Also, it does make the soil quite acidic for a bit. Don't apply it near plants that don't like acidic soil.
- Wait for a dry and sunny day - hopefully one with little wind and no chance of rain in the next 24 hours. Spray onto the leaves and at the bottom of the plants. It may require more than on application for some hardy weeds, such as dandelions.
- Many recipes like this one call for the use of 1/2 cup of salt or epsom salts. However, salt remains in soil for quite a while and can travel to the roots of your "good" plants. I don't use the salt solution, except around driveway areas and those areas far away from flowers, shrubs, or vegetable gardens.