I have been asked to list what is in my flower boxes. First of all I use soiless mix, osmocote and soil moist so I do not have to water it often. Because of the soil moist, I typically water my flower boxes once a week. The boxes are on the north side of the house. As far as the actual plants, I have planted the following:
various colors of impatients, bacopa, variegated licorice, and tri-color sweet potato vine. The impatients are primarily in the back of the box, with all of the other plants in the front so that they can cascade over.
I have had the actual boxes for about 20 years and they are made of fiberglass. My H gave them to me for my birthday and these boxes have been trouble free. Plus they can be painted any color one desires.