To build up a raised bed using dry rock – meaning rocks without mortar – proceed in layers. After excavating the hole and laying the drainage rubble, fill it to nearly ground level with prepared soil, firmly packed, then place your first layer of stones. When completed, again bring the soil mixture to near level; then repeat. (The same applies if using railroad ties, pre-fabricated kits or even tires; what matters are a sturdy frame and a level bed.)
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