I'm going to give the Vinegar method a shot. I don't know if this helps the OP but for the first time in 3 years, the grass growing in the decorative stone is outta control. I would think it has to do with the heavy rain lately.
We bought the best Weed Block and crisscrossed it and added a third level where needed and still, grass & weeds. We are living in Jurrasic Park. Good Luck.
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