Railing planters mounted on deck, patio or balcony railings add color to the particular spot and enhance its beauty. If placed strategically and allowed to grow, tall flowers or foliage planted in these planters also provide privacy and screen out curious gazers. These planters also free up ground space, allowing you to grow more flowers. Although you can purchase ready-made railing planters from any home department store, make one yourself so you can customize it according to your color or design preferences.
Measure the width of the railing to determine the planter size. Ideally, it should be as wide as the railing or even slightly wider, provided you allow an equal protrusion one each side during mounting. A height of up to 8 inches provides sufficient room for plants to grow. However, keep in mind the mature size of any tall plants the planter will contain to determine its final depth.
Purchase 1-inch-thick wood from your local hardware store. Cut it into five boards with a handsaw- two identical long pieces for the planter's front and back, two identical short pieces for the sides, and a piece as long as the front and back but as wide as the short sides that will be the base.
Sand the pieces to remove any sharp edges.
Rest the front piece on its long edge on an even surface, and hold one of the two short sides against it. Check the joint to make sure it is flush before drilling 1-inch wood screws to attach them together. Put this L-shaped structure aside.
Repeat the process to attach the second short side to the back so you have two L-shaped structures.
Place both the L-shaped structures together on your worktable so the short side of one meets the long side of the other. Align both the joints to make sure they are flush, and attach both structures together with 1-inch wood screws drilled into each short side.
Drill drainage holes, ¾- to 1-inch wide, into the base, spaced evenly apart. Sand both sides to make them smooth.
Flip the planter around so its base faces skywards. Place the base over the cavity so it rests on the edges of the planter securely, and attach it in place with wood screws.