Answer: Hand digging and then covering over the bare soil with a thick mulch will usually stop the grass from invading. Or, you might want to dig all the perennials, cover the entire bed with weed barrier landscape cloth and then replant the perennials. If that's more work than you want to put into the bed, you can use a grassy weed killer such as Poast. It is safe to use around broadleaf perennials but will kill anything that is grassy. Best wishes with your flower garden!
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