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I finished the first of my planters 2 x 8 raised beds for the front yard. Just need to get some corner trim to cover the edges of the metal. I'm going to rely on the 4x4 posts, and bottom edge of the edging being buried to provide much of the rigidity, hopefully that works out. The edging metal is very easy to bend but its only 10" tall so it shouldn't bow out. A single 20 foot roll of rusty metal edging from Amazon was enough for 1 bed. I used 2x4s to temporarily hold the 4x4s together while screwing on the metal.