You can treat a dock with chemical herbicides, but these are broad-spectrum toxins that will also kill other plants. An easier and more environmentally friendly option is to remove the dock by hand. If you decide to remove the dock by hand, be sure to get all of the roots, as they can quickly regenerate if even a small piece is left behind. You may also want to consider using a herbicide such as glyphosate (e.g. Roundup) to prevent it from coming back. Glyphosate kills all plants, so be sure not to spray it near any other desirable plants.

You can treat a dock with herbicide, but it's best to remove the plant by hand. Docks are a very common weed and they can be difficult to get rid of. The best way to remove them is by hand, pulling them up by the roots. If you have a lot of docks in your yard, you may want to use an herbicide. Be sure to read the label carefully and follow all the instructions.