Answer: Bermuda grass is very difficult to control once it is in a flower bed. Ideally it would be eliminated prior to planting, but at this point you can try to kill it individually by using an herbicide containing glyphosate. You may find that the wipe-on application method is more precise than a spray application. Be very careful to follow the instructions because this will kill your flowers if it contacts them. Once it is dry, the herbicide would not affect the butterflies, and larva would be predominently on other plants.
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