Holy Water because you need a Miracle for the Weeds to not grow thru anything you can thrown at them.
Even Double and tripling layers of Wee Block over the old layer or layers just doesn't work. The High test Vinegar worked for a bit but not long.
We may have a new solution but have not had enough time to test it during the Prime Growing Season. I'll get back to you if it works. I think it be successful.
If you find something that works long term let us know. I used the best blocker I could find from Amazon & Home Depot. No luck!
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