U-shaped garden beds are cost-effective, providing more growing space with less material costs. They work well with matching garden trellises, to enclose an area with flowering vines, fruits and vegetables. BENEFITS… - Garden Tips and Tricks
My suggestion would be to add cardboard or something up the sides to hold water. My garden did SO WELL, but it dried out easily. Also, in the individual holes, I planted herbs, green peppers and zucchini. They did excellent also!