Simple Garden Box Diy . Mario planter box plan is a special idea to gift your friend. Now, you will want to attach the 2×12 (cut to four feet) to the 4×4 corner post. 52 DIY Planter Box Plans That Are Easy To Make The SelfSufficient Living from theselfsufficientliving.com It is super easy to build too! It’s lively and easy to make. Mario planter box plan is a special idea to gift your friend.