The normal precast interlocks (Lowes and Home Depot etc.)are not designed to go that high. I believe that they are no more that 4 ft max. I built two small walls last year. I went to near 6 ft but stepped it back with a flower bed at 3 ft.

Most other solutions require tie backs into the bank with a wall that high or the wall will push out over time.

There are commercial blocks that will allow the height required you just will not find them at the local building supply.

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