Answer: There are two options. Either wipe a general purpose product like glyphosate on the grass leaves taking care to not get it on the desirable plants, or spray a grass killer which is not toxic to most other types of plants. Some example ingredients include fluazifop or sethoxydim. Once you've eradicated the grassy weeds you can keep them out by using a pre-emergent such as Preen. It is safe to use around established plants yet keeps weed seeds from germinating.
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