The advantage of a tall flower bed is that you don’t have to bend low to care for plants.
It is recommended that a tall flower bed should not be longer than two meters, and the height should not exceed a meter. The photo shows that the flower bed is located near the fence. The fence should be isolated from contact with the soil to protect its wood from damage. For such a flower bed, it is enough to dig three solid columns into the ground and nail the planks firmly to them. In the groove dug in advance, install the branches remaining after trimming the trees vertically.
The resulting container is filled with soil, and seeds are sown or seedlings of flowers planted. You can grow herbs or vegetables in this way.