I combined 2 of my favorite tools with 2 of my favorite things. The jigsaw and nail gun plus flowers and fun colors!
To make a longer planter box, all you will need to do is extend the length of the rails and top frame a bit. Then cut a few extra side panels. It is assembled the same way as the smaller planter box. The cutting diagrams and materials list are available to download in this Online Extra.
Build a planter box with attached trellis for climbing plants using these free plans.