The author is the owner of and has been professionally manufacturing and installing window boxes for many years. He recommends this method for installation for wooden and that have solid back to them
How To Pick A Window Box Color The choice of color you pick is a direct reflection of your creativity and personality and can shift the focus to the home, window, window box, or even the flowers inside... Source : A Guide for Families Pg. 192
A Guide To Make Your Own Window Box They are completely water resistant and very affordable. From an investment standpoint, theyre usually worth the few extra dollars because theyll last up to 30 years without rotting or maintenance... Source : A Guide for Families Pg. 192