Leave the stone no more than 1/2 in. higher than you want the final ... but check the installation instructions for the type of retaining wall block you're using. Backfill about 8 to 10 in.

If you decide to branch out, research the ideal material based on your climate, soil type, and your own building level. Building a stackable retaining wall is ... Stones between 1/2 to 3/4 inches ...