If you're in a freeze climate - you may wanna not lay the border on mortar. Your footing would have to be down to the frost line for it to be effective. Which here where I'm at is 32" deep!
We redid the entry to a paver driveway done by others last year where the contractor does a concrete edge restraint. It has shifted all over the place and was more difficult to correct. It gave the opportunity to see first hand the negative drawback of using concrete to restrain pavers.
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