Such a flowerbed can look very impressive, and make it not so difficult, and not much material will go. The advantages of such a flower garden are obvious: if there is not enough space to plant many flowers, then this is an ideal option.
If it is technically simple to make such a vertical flowerbed, the concern is the selection of plants for it. On the upper tier, you should probably place flowers that love the sun. All moisture after watering will drain down to other plants, which will also be watered. So, the lower tiers are given to hygrophilous specimens.