Seventeen inches of wall height on a 24 in circle is what makes this bed suit deeper crops rather than bedding plants alone. Root vegetables, established perennials and a mixed planting all have somewhere to go in a soil column that deep, and the spacious round planting area holds a wide variety at once. Working a circle is easier than working a rectangle of the same area: the center is the same short reach from every point on the rim, and a round layout keeps the arrangement organized rather than forcing rows into corners that never get used. There is no floor in the bed. The open-ended base lets water drain directly into the ground instead of standing at the bottom of 17 in of soil, air circulates upward through the column, and roots run down past the wall into native soil once they reach it. Galvanized steel panels form the ring, corrugated so the ridges reinforce them against the outward pressure that 17 in of wet soil exerts, which is what stops a tall wall from bulging or deforming over a season, and the zinc layer holds off rust through repeated soakings. Tightly fastened screws keep the panel joints steady in daily use. At 8 lbs the bed carries into place easily and assembles from the box, suiting patios, lawns, gardens and balconies.