At Flower Window Boxes TM we make over 1000 different sizes and styles of window boxes, outdoor planters, and flower boxes for railings . You can shop by our different window box designs or scroll down below and see our large selection of 48" window boxes and planters. All of our 4 foot window box planters are made of commercial grade PVC that doesn't flex or bend. Unlike vinyl and other plastics, our flower boxes are extremely durable, paintable, and ship fully constructed. Each of our window box planters goes through high end carpentry to be built using our quality no rot materials. We make a wide range of planter products as well including wrought iron window boxes made from hardened steel cut by laser. We also just introduced a PVC reinforced cedar material and now offer 4 foot cedar window boxes and cedar planters in several different size options. Our planter boxes are completely customizable and you can order them in any width up to 48" wide and lengths up to 12 feet long.