Answer: If grass is growing through the mulch, your mulch might not be thick enough. You can pull the grass out, rake the mulch away and apply a pre-emergent product such as Preen to keep weed seeds from sprouting, and then replace the mulch. Or you can use a selective grassy weed control product and spot spray the grassy weeds. I'd vote for also using a pre emergence product after you've removed the grassy weeds. Best wishes with your flower beds!
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