Apartment dwellers mount window boxes outside their windows to enjoy a splash of color and aroma they cannot otherwise enjoy due to non-availability of garden space. Window boxes provide them an opportunity to grow flowers or herbs of their choice, dressing up the exterior of their house with color and enjoying fluttering birds, butterflies and bees.
You do not need to be an expert to make window flower boxes for your windows.
Measure the width of your window and its frame to determine the length of the flower box. Ideally, it should be as wide as the window and its frame. Also decide the suitable depth for your flower box.
Use your measurements to cut the pressure-treated wood to size yourself with a circular saw, or have the store pre-cut them.
Place the five boards in front of you--two long sides for the front and back of the flower box, two short sides and a base.
Hold the base piece and drill 1/2 to 1 inch drainage holes, evenly spaced, all though its surface. Lay the base of the window box on a flat and even surface.
Stand a long side, which will be the back of the box, flush against the base piece, ensuring both the edges meet. Hold it securely into place and drill three to four 1-inch galvanized wood screws into the back piece that penetrate the base, to connect them together.
Hold a short side next to the back, ensuring both the joints between the back piece and short end, and between the base and short end, are flush and even. Drill screws into the short end that extend into the back piece so it is secure. Also drill screws into the back piece that penetrate the short end.
Repeat the procedure with the other short end piece.
Place the front piece of the flower box into place and adjust it so the joints are flush with one another. Drill wood screws into it that penetrate both the short ends.
Review the flower box, and reinforce any joint by drilling another woodscrew into place so it is firm and does not wobble.
Sand the flower window box to remove any sharp edges. Paint it a bright color so it stands out, or apply a coat or two of clear acrylic staining to protect it from natural elements.