Window boxes are an opportunity to add color, and shape to an area that is empty. While window boxes are designed to be hung under windows so that the flowers and plants can be visible from the inside of the house, these versatile containers can actually be mounted to posts, walls and fences. Bringing plants and flowers several feet off the ground enhances their visibility while filling in a void on the fence.
Select planter window boxes that suit the style of your garden. If you have a Victorian style home, choose a window box with fancy scroll and iron work. For a country garden select a simple design that may even be artificially distressed. Be willing to mix different sizes and shapes to create more interest on the fence.
Position the planter box on the fence so that it is 3 to 4 feet above the ground and will naturally fill the space. If you have a wide empty fence you may want to arrange 3 boxes of different sizes and shapes. Position your largest planter first and alter the height of each additional planter. Try to space the planters an even width apart.
Level the planter box and use a pencil to mark inside the hanger holes. Most window boxes come with their own hangers.
Screw each planter box hanger into the fence using deck screws and a power screw driver. If the fence is elderly and the wood weak, you may need to use bolts for a more secure mounting.
Place small rocks over the holes at the bottom of the planter for drainage. If you are going to use terracotta pots inside the planter box, place your drainage rocks in the pots instead. Add your favorite potting mix and the flowers and plants best suited to the garden location. Water your new planter well to give your plants a good start.