Answer: Dollar weed or pennywort is difficult to eradicate in flower beds because any chemical that will kill it will kill your flowers, too. The best way to get rid of the weed is to throughly soak the flower bed and then hand pull all the weeds, roots and all. It sounds more difficult than it really is - dollar weed pulls out quite easily when the ground is wet.
Wish I had an easier solution for you!
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