Metal has the tendency to rust and rot while wood can decay after being used for a long period of time.
Cinder blocks on the other hand are more durable and add more appeal to your garden.
The cinder blocks allow you to explore different ways of designing your garden because they also offer different potting options. For instance, you can opt to grow your plants, herbs, or flowers within the hollow space inside the cinder blocks rather than in the flower bed space created by combining the blocks together.
Additionally, cinder block raised garden beds are cost friendly in the long run because they are durable and will not require any repairs in future. The cinder blocks also come in different shapes and sizes which make them easily customizable to create the garden design that you desire.
For example, you can stack the cinder blocks on top of each other to have a highly raised garden bed that will reduce your joint and back pains. Also, you can arrange the cinder blocks in a creative way to create an artistic pattern around your garden. For instance, you can create a rectangular shape by using rectangular cinder blocks to form the edges of the raised garden bed.
All you need to do is dig the ground a little bit in order to make it level. Add the cinder blocks carefully into the ground while stacking them next to each other to create a solid boundary. Add soil and mulch inside the frame of the cinder blocks to create a fertile garden bed.
For a more aesthetic look, you can cover the cinder block tops with tiles to make the garden more attractive.