At Flower Window Boxes TM we make over 1000 different sizes and styles of window boxes, planter boxes, and railing flower boxes. You can shop by window box design or scroll down below and see all of our selection in that size. All of our window boxes are made from an architectural grade PVC material that is solid, paintable, and ships fully constructed through high end carpentry using no rot materials. We also have a line of high end wrought iron window boxes made from laser cut steel that are guaranteed to be the strongest in the industry. Lastly, we also specialize in custom window boxes with a quick turnaround.