How do I stop weeds/grass growing between the joints in this paving in my garden? Should I dig it all out and replace with concrete? I know there's a type of sand you can brush into the joints, but I kind of want something permanent if possible. It's a day's work clearing the weeds and they just grow back within 2 weeks. I don't want to use Roundup or anything like that.
The first picture is what it looks like after I clear them all.
by WarmMidnight1562
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