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If you spray a DIY vinegar solution that contains high salt, it can disrupt the soil's structure and make it difficult for plants to grow. That's why it's vital to avoid spraying vinegar solution on areas where you are trying to grow plants and flowers. When using a mix of vinegar and soap, some say you can plant a few days after the vinegar dries. 

Yes, vinegar can be an effective way to kill individual dandelion plants to help in the hand-removal process. However, vinegar can also kill turfgrass, so use a targeted spray.

The safest method to avoid killing your turf grass is hand pulling Johnsongrass. You can also apply vinegar for a safer herbicide, but it will still burn your lawn if it gets on it.

Burning is not a recommended method for controlling foxtail grasses. In a large pasture scenario, the fire moves too quickly through the weeds to effectively burn and kill the seeds, meaning they will resprout eventually. If your lawn is overrun with foxtails, it’s best to consult a lawn care professional for suggestions on how to permanently remove it from your property.