Things You Will Need
You will need 36 - 42 wedge shaped landscaping blocks. The number depends on the angle of the block. Twelve, thirteen or fourteen blocks will form a complete circle, depending on brand and style. Product literature or someone at your home center can help you determine the full circle number. Three courses makes an attractive height. You'll also need a couple bags of sand. As for tools, you'll need a mattock, shovel, level, mallet, landscaping spray paint, a steel stake and a piece of string.