Apartment living rarely affords you the opportunity to enjoy a flower garden. However, most places can accommodate a window box in which to grow the flowers or vegetation of your choice. Depending upon the amount of available light and the size of the box, you can plant an herb garden, a mini rose garden, beautiful greenery and much more. The steps below outline the building of a very simple, rectangular flower box that is meant to be set on a window ledge or attached directly to it.
Cut out the pieces to your window box using the dimensions you obtained in Step 1.
Determine the size of the box your window can hold (length, width and depth) and decide on a type of wood to use. Be sure to choose wood that can withstand the changing elements, like a pressure-treated redwood.
Place one side of the window box inside the back piece, making sure the joint is even and solid. When you have achieved a perfect angle, nail the pieces together. Repeat the same process with the other side.
Sand away any and all rough edges until the box is perfectly smooth on all sides. If desired, attach a finished piece of finish molding around the top of the box to give it a more polished look.
Add gravel to the bottom of the window flower box to assist in drainage.