After deciding on the size of the planter box, using either purchased boards or boards leftover from other projects, cut the side and end pieces to the size you want. Then screw them together to form a box. Measure the inside length and width, so you can cut a piece for the bottom. Secure the bottom through the sides with galvanized screws.
Attach cleats to the bottom of the box for a nice profile. Then drill three or four drainage holes in the bottom.
Cut a piece of vinyl or nylon screen to fit into the bottom of the box. The screen will help hold gravel and dirt in the box.
You can screw the box directly to your deck railing. Another option is to use a store-bought bracket system that attaches to the side of the railing.
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