Answer: Preen is just about as good as any pre emergence herbicide as you can use for your flower beds. It won't kill existing weeds but it will stop weed seeds from germinating. Don't apply more often as recommended on the label - you'll overdo with herbicides and it can affect the plants in the beds. Just hand pull any existing weeds and let the Preen to its job of keeping new weeds from sprouting. Best wishes with your flower bed!
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