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This plant can be rather aggressive once it gets started. There are a few things you can do. Boiling water seems to be most effective without changing the environment of the soil. Just pour onto the spots that you want to kill. Here is an article to some other methods of control:

https://www.gardeningknowhow.com/plant-problems/weeds/eliminate-dollar-weed.htm

I have asked our Editors to look at the articles.

In this case, I would recommend, very carefully, spraying them with vinegar while avoiding your other plants. This will make quick work of them. This article will help: https://www.gardeningknowhow.com/plant-problems/weeds/eliminate-dollar-weed.htm

There are many ways to control this, both chemical and non chemical. This article will get you started: https://www.gardeningknowhow.com/plant-problems/weeds/eliminate-dollar-weed.htm

You will need to apply as often as it takes to rid the plants. This can be daily or weekly.

There are quite a few options to choose from, here! Some methods of control are natural, and some are chemical. It will be up to you to choose which methods suits you best.

My, personal, favorite is using boiling water. This will kill off most stubborn weeds, and will leave your soil perfectly usable after treatment.

This article will help:

https://www.gardeningknowhow.com/plant-problems/weeds/eliminate-dollar-weed.htm