Answer: Because stackable blocks are not reinforced, they are best suited for walls under four feet in height. If you want to use the material, the best approach is to build a segmental wall so that each segment has a height of only 2 1/2 feet. You'll need to backfill and compact the soil for the first segment and then build the second segment a few feet behind the first wall. This will increase your planting area and ensure the wall doesn't lean or tumble a few years after installation.
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