Answer: Sounds like a really persistent grass! I don't think your cement borders are quite deep enough. You may want to use a metal grass barrier on the insides of your cement borders. These are strips of metal that you pound down into the ground. They will go deeper than your cement borders and will both sever the grass that is currently growing into the flower beds and will stop any future grass from waging another underground attack. Install the barriers on the flower bed side of the concrete border and then hand pull the grass that is in the flower bed. This should stop the problem. Best wishes with your landscape!
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