Pour 10 percent concentrated vinegar (acetic acid) on the bottom of your horsetails and the soil around them. Wait for one week. The vinegar will make the soil too acidic to sustain plant life, killing off the horsetail plants completely within a few days.

Does white vinegar kill mares tail?

If you'd rather not use a chemical to combat horsetail – white distilled vinegar is a great alternative. Because vinegar is an acid, it's non-specific as to what it will kill. You may need to check the condition of the soil by running a soil test once you've got to grips with the horsetail infestation.

Does vinegar kill horsetail?

Applying a high-strength vinegar, mixed with a small amount of dish soap (to make the vinegar stick to the plants) can kill the above-ground growth of horsetail quickly. The acetic acid in the vinegar attacks horsetail leaves and stems.